Change CLA branch to clasignatures

Author: sandboxws

.github/workflows/cla.yml

@@ -27,7 +27,7 @@ jobs:
         with:
           path-to-signatures: "signatures/cla.json"
           path-to-document: ".github/CLA.md"
-          branch: "main"
+          branch: "clasignatures"
           allowlist: "sandboxws,dependabot[bot],renovate[bot],github-actions[bot]"
           custom-notsigned-prcomment: |
             Thank you for your contribution! Before we can merge this PR, we need you to sign our [Contributor License Agreement]($CLA_DOCUMENT_URL).