Fix the linter

Signed-off-by: Lukasz Gryglicki <lgryglicki@cncf.io>

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Assisted by [Claude](https://claude.ai)

Author: lukaszgryglicki

cla-backend-go/.golangci.yaml

@@ -4,6 +4,7 @@
 # More info on config here: https://github.com/golangci/golangci-lint#config-file
 run:
   deadline: 5m
+  go: "1.24"
   issues-exit-code: 1
   tests: true
   skip-dirs:

cla-backend-go/github/github_repository.go

@@ -2630,15 +2630,15 @@ func GetReturnURL(ctx context.Context, installationID, repositoryID int64, pullR
 		return "", err
 	}
 	if repo == nil {
-		err := fmt.Errorf("missing repository for repository ID %d", repositoryID)
+		err = fmt.Errorf("missing repository for repository ID %d", repositoryID)
 		log.WithFields(f).WithError(err).Warn("invalid repository metadata")
 		return "", err
 	}
 
 	owner := repo.GetOwner().GetLogin()
 	name := repo.GetName()
 	if owner == "" || name == "" {
-		err := fmt.Errorf("invalid repository owner/name for repository ID %d", repositoryID)
+		err = fmt.Errorf("invalid repository owner/name for repository ID %d", repositoryID)
 		log.WithFields(f).WithError(err).Warn("invalid repository metadata")
 		return "", err
 	}