Concurrency

Author: vdusek

.github/workflows/_tests.yaml

@@ -14,5 +14,5 @@ jobs:
     with:
       python_versions: '["3.10", "3.11", "3.12", "3.13", "3.14"]'
       operating_systems: '["ubuntu-latest", "windows-latest"]'
-      tests_concurrency: "16"
+      tests_concurrency: "1"
       # Codecov inputs omitted - apify-shared-python doesn't use codecov.