ci: change if always() to if not cancelled on test results uploads

Signed-off-by: Spencer Murray <spencer.murray@sentry.io>

.github/workflows/phpunit-pgsql.yml

@@ -125,7 +125,7 @@ jobs:
           flags: phpunit-postgres
 
       - name: Upload test results
-        if: always()
+        if: ${{ !cancelled() }}
         uses: codecov/test-results-action@v1.1.0
         with:
           flags: phpunit-postgres