fix: Do not ignore file deletion errors

When deleting a file errors (such as "409 Could not delete file: Changes must be made through a pull request") should not be silently ignored leaving the file undeleted from the repo but deleted from the state

Author: giner

github/resource_github_repository_file.go

@@ -505,7 +505,7 @@ func resourceGithubRepositoryFileDelete(d *schema.ResourceData, meta interface{}
 
 	_, _, err := client.Repositories.DeleteFile(ctx, owner, repo, file, opts)
 	if err != nil {
-		return nil
+		return err
 	}
 
 	return nil