ci(renovate): remove unhandled options to fix pip-compile errors

[mnencia]

The Renovate pip-compile provider is not running due to some options in the
requirements.txt that are set to None, which is the actual default.

DEBUG: pip-compile: extracted command from header (repository=local)
       "fileName": "containers/sidecar-requirements.txt",
       "argv": [
         "pip-compile",
         "--allow-unsafe",
         "--cert=None",
         "--client-cert=None",
         "--generate-hashes",
         "--index-url=None",
         "--output-file=sidecar-requirements.txt",
         "--pip-args=None",
         "--strip-extras",
         "sidecar-requirements.in"
       ],
       "commandType": "pip-compile"
DEBUG: pip-compile: option not handled (repository=local)
       "option": "--allow-unsafe"
 WARN: pip-compile error (repository=local)
       "matchedFile": "containers/sidecar-requirements.txt",
       "errorMessage": "Option --cert=None not supported (yet)"

Removing the options fixes the run.