Update python.yml

Author: chenylee-aws

.github/workflows/python.yml

@@ -20,7 +20,7 @@ jobs:
     if: ${{ github.event_name == 'push' || (github.event_name == 'pull_request_target' && !contains(github.event.pull_request.labels.*.name, 'skip-sample-tests')) }}
     outputs:
       should_run: 'true'
-      is_fork: ${{ github.event_name == 'pull_request_target' && (github.event.pull_request.head.repo.fork || github.event.pull_request.user.login == 'dependabot[bot]') }}
+      is_fork: ${{ github.event_name == 'pull_request_target' && (github.event.pull_request.head.repo.full_name != github.repository || github.event.pull_request.user.login == 'dependabot[bot]') }}
     steps:
       - run: echo "Evaluating workflow conditions"