fix: trim branch name before comparing to master (#19856)

script/lib/utils.js

@@ -47,7 +47,7 @@ async function getCurrentBranch (gitDir) {
       '--remote'
     ], gitDir)).split('\n')
 
-    branch = branches.filter(b => b === 'master' || b.match(/[0-9]+-[0-9]+-x/))[0]
+    branch = branches.filter(b => b.trim() === 'master' || b.match(/[0-9]+-[0-9]+-x/))[0]
     if (!branch) {
       console.log(`${fail} no release branch exists for this ref`)
       process.exit(1)