Exclude file permissions line from gosec linting

The [gosec linter](https://github.com/securego/gosec) warns
[by default on file permissions above 0600](securego/gosec#107)
We need the permissions to be 0644 for this line (because it has to be
written to), so we exclude it from linting.

Author: johnboyes

internal/github/action.go

@@ -127,7 +127,7 @@ func (a *Action) pullRequestNumber() int {
 func (a *Action) outputResult(result string) {
 	labelCheckOutput := fmt.Sprintf("label_check=%s", result)
 	gitHubOutputFileName := filepath.Clean(os.Getenv("GITHUB_OUTPUT"))
-	githubOutputFile, err := os.OpenFile(gitHubOutputFileName, os.O_APPEND|os.O_WRONLY, 0o644)
+	githubOutputFile, err := os.OpenFile(gitHubOutputFileName, os.O_APPEND|os.O_WRONLY, 0o644) //nolint:gosec
 	panic.IfError(err)
 	_, err = githubOutputFile.WriteString(labelCheckOutput)
 	if err != nil {