Update cla.yaml (#138)

Remove ORG_TOKEN as it's no longer needed and we want to delete it from
our github org.

Author: fleupold

.github/workflows/cla.yaml

@@ -15,7 +15,6 @@ jobs:
         uses: contributor-assistant/github-action@v2.6.1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          PERSONAL_ACCESS_TOKEN : ${{ secrets.ORG_TOKEN }}
         with:
           branch: 'cla-signatures'
           path-to-signatures: 'signatures/version1/cla.json'