fix: bug running changed files with limited history (#1188)

Co-authored-by: GitHub Action <action@github.com>

dist/index.js

@@ -222,7 +222,7 @@ const getSHAForPushEvent = (inputs, env, workingDirectory, isShallow, hasSubmodu
                     '--progress',
                     `--deepen=${inputs.fetchDepth}`,
                     'origin',
-                    `+refs/tags/${sourceBranch}:refs/remotes/origin/${sourceBranch}`
+                    `+refs/heads/${sourceBranch}:refs/remotes/origin/${sourceBranch}`
                 ]
             });
         }