python-werkzeug: bump to 3.1.6

python-werkzeug: bump to 3.1.6

Changelog since 3.1.3:
- v3.1.4: Fix special device name access on Windows in send_from_directory
  (security); fix multipart parser \r\n handling at chunk boundaries;
  improve Watchdog reloader CPU efficiency
- v3.1.5: Extend Windows path protection against special device names
  (security); fix multipart form parser \r\n at chunk boundaries; fix
  AttributeError in DebuggedApplication with pin_security=False
- v3.1.6: Block special device names in multi-segment paths on Windows
  via safe_join (security)

Add test.sh.

Full changelog:
https://werkzeug.palletsprojects.com/en/stable/changes/

Signed-off-by: Alexandru Ardelean <redacted>