Zizmor: default config is no longer being used

There is a global config for Zizmor here:
https://github.com/grafana/shared-workflows/blob/main/.github/zizmor.yml

Previously, it was working as an "addition" to a Zizmor config local to the repository. Today, Zizmor started failing on my PR with this output:
```
�[1m�[91merror[unpinned-uses]�[0m�[1m: unpinned action reference�[0m
�[1m�[94m--> �[0m./.github/workflows/helm-release.yaml:65:11
�[1m�[94m|�[0m
�[1m�[94m65�[0m �[1m�[94m|�[0m uses: grafana/helm-charts/.github/workflows/update-helm-repo.yaml@main
�[1m�[94m|�[0m �[1m�[91m^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m �[1m�[91maction is not pinned to a hash (required by blanket policy)�[0m
�[1m�[94m|�[0m
�[1m�[94m= �[0m�[1mnote�[0m: audit confidence → High
�[1m�[94m= �[0m�[1mhelp�[0m: audit documentation → �[32mhttps://docs.zizmor.sh/audits/#unpinned-uses�[39m

�[1m�[91merror[unpinned-uses]�[0m�[1m: unpinned action reference�[0m
�[1m�[94m--> �[0m./.github/workflows/publish-techdocs.yaml:17:11
�[1m�[94m|�[0m
�[1m�[94m17�[0m �[1m�[94m|�[0m uses: grafana/shared-workflows/.github/workflows/publish-techdocs.yaml@main
�[1m�[94m|�[0m �[1m�[91m^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m �[1m�[91maction is not pinned to a hash (required by blanket policy)�[0m
�[1m�[94m|�[0m
�[1m�[94m= �[0m�[1mnote�[0m: audit confidence → High
�[1m�[94m= �[0m�[1mhelp�[0m: audit documentation → �[32mhttps://docs.zizmor.sh/audits/#unpinned-uses�[39m

�[32m50�[39m findings (�[1m�[93m7�[39m ignored, �[93m41�[39m suppressed�[0m): �[35m0�[39m informational, �[36m0�[39m low, �[33m0�[39m medium, �[31m2�[39m high
```
Copied from this [comment](https://github.com/grafana/k6-operator/pull/741#issuecomment-4070187704).

After [copy-pasting](https://github.com/grafana/k6-operator/pull/741/commits/854d1a3f40e5bd214cad99f27f0dccad52a0c597) global config to my local config, Zizmor check passed successfully.

In addition, the un-printable characters in the output are new too: Zizmor output was prettier in the past.

Could it be that some recent update to Zizmor workflow broke the "overlay" of configs?