Ignore branch when creating a version anchor (#5263)

We currently insist that you're on `main` when creating an anchor, to
avoid anchors being created that result in identical build numbers being
applied to different commits. However, this doesn't really apply now
that we have release branches with their own build sequence, so we need
to relax this restriction. This change just removes the superfluous
check.

versions/create-anchor.js

@@ -26,12 +26,6 @@ if (fs.existsSync(anchorPath)) {
 	return 0;
 }
 
-const branch = child_process.execSync('git rev-parse --abbrev-ref HEAD').toString().trim();
-if (branch !== 'main') {
-	console.error(`Commit anchors can only be created on the main branch. You're on '${branch}'.`);
-	return 1;
-}
-
 // Create the anchor file with the commit hash at the head of the current branch
 const commit = child_process.execSync('git rev-parse HEAD').toString().trim();
 fs.writeFileSync(anchorPath, commit);