v8.0 module release (#22975)

https://mattermost.atlassian.net/browse/MM-52079

```release-note
We upgrade the module version to 8.0. The new module path is github.com/mattermost-server/server/v8.
```


Co-authored-by: Doug Lauder <wiggin77@warpmail.net>

server/platform/services/httpservice/httpservice.go

@@ -10,7 +10,7 @@ import (
 	"time"
 	"unicode"
 
-	"github.com/mattermost/mattermost-server/v6/server/platform/services/configservice"
+	"github.com/mattermost/mattermost-server/server/v8/platform/services/configservice"
 )
 
 // HTTPService wraps the functionality for making http requests to provide some improvements to the default client