Fix error on git rev-list (#1528)

Error: `fatal: ambiguous argument 'main': both revision and filename`
means that there is both a branch named _main_ and a file or a
directory, named _main_.

Fixes #1526

Author: mazhelez

Actions/CheckForUpdates/CheckForUpdates.ps1

@@ -212,7 +212,7 @@ else {
     # $update set, update the files
     try {
         # If a pull request already exists with the same REF, then exit
-        $branchSHA = RunAndCheck git rev-list -n 1 $updateBranch
+        $branchSHA = RunAndCheck git rev-list -n 1 $updateBranch '--'
         $commitMessage = "[$($updateBranch)@$($branchSHA.SubString(0,7))] Update AL-Go System Files from $templateInfo - $($templateSha.SubString(0,7))"
 
         # Get Token with permissions to modify workflows in this repository

RELEASENOTES.md

@@ -4,6 +4,7 @@
 - Issue 1521 Dependencies not installed for multi project incremental PR build
 - Issue 1522 Strange warnings in Deploy job post update to AL-Go 6.4
 - BcContainerHelper settings were only read from .github/AL-Go-Settings.json, not allowing global settings in ALGoOrgSettings for TrustedNuGetFeeds, MemoryLimit and other things that should be possible to define globally
+- Issue 1526 When updating AL-Go system files, the update process (creating a PR or directly pushing to the branch) fails when there is a file or directory in the repo with the same name as the branch that is to be updated
 
 ## v6.4