[Internal] Fix datetime.timezone.UTC -> utc (#4438)

## Changes
<!-- Summary of your changes that are easy to understand -->

## Tests
<!-- 
How is this tested? Please see the checklist below and also describe any
other relevant tests
-->

- [ ] `make test` run locally
- [ ] relevant change in `docs/` folder
- [ ] covered with integration tests in `internal/acceptance`
- [ ] using Go SDK
- [ ] using TF Plugin Framework

Author: mgyucht

tagging.py

@@ -304,7 +304,7 @@ def push_changes() -> None:
 
     # Create the release metadata file
     file_name = os.path.join(os.getcwd(), ".release_metadata.json")
-    metadata = {"timestamp": datetime.now(tz=timezone.UTC).strftime("%Y-%m-%d %H:%M:%S%Z")}
+    metadata = {"timestamp": datetime.now(tz=timezone.utc).strftime("%Y-%m-%d %H:%M:%S%Z")}
     with open(file_name, "w") as f:
         json.dump(metadata, f, indent=4)