Upgrade Go to 1.24.3 (#31220)

* Upgrade Go to 1.24.3

Updates the following files:
- server/.go-version: 1.23.9 → 1.24.3
- server/build/Dockerfile.buildenv: golang:1.23.9-bullseye → golang:1.24.3-bullseye
- server/go.mod: go 1.23.0 → go 1.24.3, toolchain go1.23.9 → go1.24.3
- server/public/go.mod: go 1.23.0 → go 1.24.3, toolchain go1.23.9 → go1.24.3

Also fixes non-constant format string errors introduced by Go 1.24.3's stricter format string checking:
- Added response() helper function in slashcommands/util.go for simple string responses
- Removed unused responsef() function from slashcommands/util.go
- Replaced responsef() with response() for translated strings that don't need formatting
- Fixed fmt.Errorf and fmt.Fprintf calls to use proper format verbs instead of string concatenation
- Updated marketplace buildURL to handle format strings conditionally

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Update generated mocks for Go 1.24.3

Regenerated mocks using mockery v2.53.4 to ensure compatibility with Go 1.24.3.
This addresses mock generation failures that occurred with the Go upgrade.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Update to bookworm and fix non-existent sha

Signed-off-by: Stavros Foteinopoulos <stafot@gmail.com>

* fix non-constant format string

---------

Signed-off-by: Stavros Foteinopoulos <stafot@gmail.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Stavros Foteinopoulos <stafot@gmail.com>

server/channels/app/notification_email_test.go

@@ -130,7 +130,7 @@ func TestGetNotificationEmailBodyFullNotificationGroupChannel(t *testing.T) {
 
 	body, err := th.App.getNotificationEmailBody(th.Context, recipient, post, channel, channelName, senderName, teamName, teamURL, emailNotificationContentsType, true, translateFunc, "user-avatar.png")
 	require.NoError(t, err)
-	require.Contains(t, body, "sent you a new message", fmt.Sprintf("Expected email text 'sent you a new message. Got "+body))
+	require.Contains(t, body, "sent you a new message", fmt.Sprintf("Expected email text 'sent you a new message. Got %s", body))
 	require.Contains(t, body, post.Message, fmt.Sprintf("Expected email text '%s'. Got %s", post.Message, body))
 	require.Contains(t, body, teamURL, fmt.Sprintf("Expected email text '%s'. Got %s", teamURL, body))
 }
@@ -162,7 +162,7 @@ func TestGetNotificationEmailBodyFullNotificationPrivateChannel(t *testing.T) {
 
 	body, err := th.App.getNotificationEmailBody(th.Context, recipient, post, channel, channelName, senderName, teamName, teamURL, emailNotificationContentsType, true, translateFunc, "user-avatar.png")
 	require.NoError(t, err)
-	require.Contains(t, body, "mentioned you in a message", fmt.Sprintf("Expected email text 'mentioned you in a message. Got "+body))
+	require.Contains(t, body, "mentioned you in a message", fmt.Sprintf("Expected email text 'mentioned you in a message. Got %s", body))
 	require.Contains(t, body, post.Message, fmt.Sprintf("Expected email text '%s'. Got %s", post.Message, body))
 	require.Contains(t, body, teamURL, fmt.Sprintf("Expected email text '%s'. Got %s", teamURL, body))
 }
@@ -194,7 +194,7 @@ func TestGetNotificationEmailBodyFullNotificationDirectChannel(t *testing.T) {
 
 	body, err := th.App.getNotificationEmailBody(th.Context, recipient, post, channel, channelName, senderName, teamName, teamURL, emailNotificationContentsType, true, translateFunc, "user-avatar.png")
 	require.NoError(t, err)
-	require.Contains(t, body, "sent you a new message", fmt.Sprintf("Expected email text 'sent you a new message. Got "+body))
+	require.Contains(t, body, "sent you a new message", fmt.Sprintf("Expected email text 'sent you a new message. Got %s", body))
 	require.Contains(t, body, post.Message, fmt.Sprintf("Expected email text '%s'. Got %s", post.Message, body))
 	require.Contains(t, body, teamURL, fmt.Sprintf("Expected email text '%s'. Got %s", teamURL, body))
 }
@@ -554,7 +554,7 @@ func TestGetNotificationEmailBodyGenericNotificationGroupChannel(t *testing.T) {
 
 	body, err := th.App.getNotificationEmailBody(th.Context, recipient, post, channel, channelName, senderName, teamName, teamURL, emailNotificationContentsType, true, translateFunc, "user-avatar.png")
 	require.NoError(t, err)
-	require.Contains(t, body, "sent you a new message", fmt.Sprintf("Expected email text 'sent you a new message. Got "+body))
+	require.Contains(t, body, "sent you a new message", fmt.Sprintf("Expected email text 'sent you a new message. Got %s", body))
 	require.Contains(t, body, teamURL, fmt.Sprintf("Expected email text '%s'. Got %s", teamURL, body))
 }
 
@@ -616,7 +616,7 @@ func TestGetNotificationEmailBodyGenericNotificationDirectChannel(t *testing.T)
 
 	body, err := th.App.getNotificationEmailBody(th.Context, recipient, post, channel, channelName, senderName, teamName, teamURL, emailNotificationContentsType, true, translateFunc, "user-avatar.png")
 	require.NoError(t, err)
-	require.Contains(t, body, "sent you a new message", fmt.Sprintf("Expected email text 'sent you a new message. Got "+body))
+	require.Contains(t, body, "sent you a new message", fmt.Sprintf("Expected email text 'sent you a new message. Got %s", body))
 	require.Contains(t, body, teamURL, fmt.Sprintf("Expected email text '%s'. Got %s", teamURL, body))
 }