MM-36271: Bump major version to 6.0 (#17973)

https://mattermost.atlassian.net/browse/MM-36271

```release-note
We bump the major version to 6.0
```

model/bundle_info.go

@@ -4,7 +4,7 @@
 package model
 
 import (
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 type BundleInfo struct {

model/client4_test.go

@@ -25,7 +25,7 @@ func TestClient4TrimTrailingSlash(t *testing.T) {
 	}
 }
 
-// https://github.com/mattermost/mattermost-server/v5/issues/8205
+// https://github.com/mattermost/mattermost-server/v6/issues/8205
 func TestClient4CreatePost(t *testing.T) {
 	post := &Post{
 		Props: map[string]interface{}{

model/command_args.go

@@ -7,7 +7,7 @@ import (
 	"encoding/json"
 	"io"
 
-	"github.com/mattermost/mattermost-server/v5/shared/i18n"
+	"github.com/mattermost/mattermost-server/v6/shared/i18n"
 )
 
 type CommandArgs struct {

model/command_response.go

@@ -9,7 +9,7 @@ import (
 	"io/ioutil"
 	"strings"
 
-	"github.com/mattermost/mattermost-server/v5/utils/jsonutils"
+	"github.com/mattermost/mattermost-server/v6/utils/jsonutils"
 )
 
 const (

model/config.go

@@ -20,8 +20,8 @@ import (
 
 	"github.com/mattermost/ldap"
 
-	"github.com/mattermost/mattermost-server/v5/shared/filestore"
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/filestore"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 const (

model/gitlab/gitlab.go

@@ -10,8 +10,8 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/mattermost/mattermost-server/v5/einterfaces"
-	"github.com/mattermost/mattermost-server/v5/model"
+	"github.com/mattermost/mattermost-server/v6/einterfaces"
+	"github.com/mattermost/mattermost-server/v6/model"
 )
 
 type GitLabProvider struct {

model/post.go

@@ -14,7 +14,7 @@ import (
 	"sync"
 	"unicode/utf8"
 
-	"github.com/mattermost/mattermost-server/v5/shared/markdown"
+	"github.com/mattermost/mattermost-server/v6/shared/markdown"
 )
 
 const (

model/session.go

@@ -9,7 +9,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 const (

model/user.go

@@ -18,8 +18,8 @@ import (
 	"golang.org/x/crypto/bcrypt"
 	"golang.org/x/text/language"
 
-	"github.com/mattermost/mattermost-server/v5/services/timezones"
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/services/timezones"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 const (

model/utils.go

@@ -22,7 +22,7 @@ import (
 	"time"
 	"unicode"
 
-	"github.com/mattermost/mattermost-server/v5/shared/i18n"
+	"github.com/mattermost/mattermost-server/v6/shared/i18n"
 	"github.com/pborman/uuid"
 )
 

model/websocket_request.go

@@ -7,7 +7,7 @@ import (
 	"encoding/json"
 	"io"
 
-	"github.com/mattermost/mattermost-server/v5/shared/i18n"
+	"github.com/mattermost/mattermost-server/v6/shared/i18n"
 )
 
 // WebSocketRequest represents a request made to the server through a websocket.