fix: containers/sidecar-requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-ZIPP-7430899

Signed-off-by: snyk-bot <[email protected]>

Author: snyk-bot

containers/sidecar-requirements.txt

@@ -788,3 +788,4 @@ setuptools==80.9.0 \
     # via
     #   -r sidecar-requirements.in
     #   barman
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability