test: Change where not occurs

Author: anth-volk

.github/workflows/pull_request.yaml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     if: |
       (github.repository == 'PolicyEngine/policyengine-us-data')
-      && (github.event.head_commit.message != 'Update PolicyEngine US data')
+      && !(github.event.head_commit.message == 'Update PolicyEngine US data')
     steps:
       - name: Checkout code
         uses: actions/checkout@v4