Fix getBaseGitBranch

Author: jdalton

src/commands/fix/git.ts

@@ -24,7 +24,7 @@ function getPkgNameFromPurlObj(purlObj: PackageURL): string {
 export function getBaseGitBranch() {
   // Lazily access constants.ENV[GITHUB_REF_NAME].
   return (
-    constants.ENV[GITHUB_REF_NAME] ??
+    constants.ENV[GITHUB_REF_NAME] ||
     // GitHub defaults to branch name "main"
     // https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-branches#about-the-default-branch
     'main'