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/cmd/mmctl/commands/user_e2e_test.go

@@ -477,7 +477,7 @@ func (s *MmctlE2ETestSuite) TestVerifyUserEmailWithoutTokenCmd() {
 		var expected error
 
 		expected = multierror.Append(
-			expected, fmt.Errorf("unable to verify user "+user.Id+" email: You do not have the appropriate permissions."),
+			expected, fmt.Errorf("unable to verify user %s email: You do not have the appropriate permissions.", user.Id),
 		)
 
 		s.Require().EqualError(err, expected.Error())

server/cmd/mmctl/commands/user_test.go

@@ -1753,7 +1753,7 @@ func (s *MmctlUnitTestSuite) TestResetUserMfaCmd() {
 		var expected error
 
 		expected = multierror.Append(
-			expected, fmt.Errorf("unable to reset user \"userId\" MFA. Error: "+mockError.Error()),
+			expected, fmt.Errorf("unable to reset user \"userId\" MFA. Error: %s", mockError.Error()),
 		)
 
 		s.Require().EqualError(err, expected.Error())
@@ -1814,7 +1814,7 @@ func (s *MmctlUnitTestSuite) TestResetUserMfaCmd() {
 			),
 		)
 		expected = multierror.Append(
-			expected, fmt.Errorf("unable to reset user \""+users[1]+"\" MFA. Error: "+mockError.Error()),
+			expected, fmt.Errorf("unable to reset user \"%s\" MFA. Error: %s", users[1], mockError.Error()),
 		)
 
 		s.Require().EqualError(err, expected.ErrorOrNil().Error())