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
```

shared/driver/conn.go

@@ -7,7 +7,7 @@ import (
 	"context"
 	"database/sql/driver"
 
-	"github.com/mattermost/mattermost-server/v5/plugin"
+	"github.com/mattermost/mattermost-server/v6/plugin"
 )
 
 // Conn is a DB driver conn implementation

shared/driver/driver.go

@@ -12,7 +12,7 @@ import (
 	"context"
 	"database/sql/driver"
 
-	"github.com/mattermost/mattermost-server/v5/plugin"
+	"github.com/mattermost/mattermost-server/v6/plugin"
 )
 
 var (

shared/driver/objects.go

@@ -7,7 +7,7 @@ import (
 	"context"
 	"database/sql/driver"
 
-	"github.com/mattermost/mattermost-server/v5/plugin"
+	"github.com/mattermost/mattermost-server/v6/plugin"
 )
 
 type wrapperTx struct {

shared/filestore/filesstore_test.go

@@ -16,7 +16,7 @@ import (
 	"github.com/stretchr/testify/suite"
 	"github.com/xtgo/uuid"
 
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 func randomString() string {

shared/filestore/localstore.go

@@ -13,7 +13,7 @@ import (
 
 	"github.com/pkg/errors"
 
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 const (

shared/filestore/mocks/FileBackend.go

@@ -7,7 +7,7 @@ package mocks
 import (
 	io "io"
 
-	filestore "github.com/mattermost/mattermost-server/v5/shared/filestore"
+	filestore "github.com/mattermost/mattermost-server/v6/shared/filestore"
 
 	mock "github.com/stretchr/testify/mock"
 

shared/filestore/s3store.go

@@ -17,7 +17,7 @@ import (
 	"github.com/minio/minio-go/v7/pkg/encrypt"
 	"github.com/pkg/errors"
 
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 // S3FileBackend contains all necessary information to communicate with

shared/i18n/i18n.go

@@ -14,7 +14,7 @@ import (
 
 	"github.com/mattermost/go-i18n/i18n"
 
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 const defaultLocale = "en"

shared/mail/mail.go

@@ -17,7 +17,7 @@ import (
 	"github.com/pkg/errors"
 	gomail "gopkg.in/mail.v2"
 
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 const (

shared/mfa/mfa_test.go

@@ -12,8 +12,8 @@ import (
 	"time"
 
 	"github.com/dgryski/dgoogauth"
-	"github.com/mattermost/mattermost-server/v5/plugin/plugintest/mock"
-	"github.com/mattermost/mattermost-server/v5/store/storetest/mocks"
+	"github.com/mattermost/mattermost-server/v6/plugin/plugintest/mock"
+	"github.com/mattermost/mattermost-server/v6/store/storetest/mocks"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )

shared/mlog/global_test.go

@@ -13,7 +13,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 func TestLoggingBeforeInitialized(t *testing.T) {

shared/mlog/human/entry.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 type LogEntry struct {

shared/mlog/human/parser.go

@@ -12,7 +12,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 func ParseLogMessage(msg string) LogEntry {

shared/mlog/log_test.go

@@ -10,7 +10,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"github.com/mattermost/mattermost-server/v5/shared/mlog"
+	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
 // Test race condition when shutting down advanced logging. This test must run with the -race flag in order to verify

shared/templates/templates.go

@@ -12,7 +12,7 @@ import (
 	"sync"
 
 	"github.com/fsnotify/fsnotify"
-	"github.com/mattermost/mattermost-server/v5/utils/fileutils"
+	"github.com/mattermost/mattermost-server/v6/utils/fileutils"
 )
 
 // Container represents a set of templates that can be render