Bump chainguard-dev/actions from 1.5.16 to 1.6.0 in the actions group

Bumps the actions group with 1 update: [chainguard-dev/actions](https://github.com/chainguard-dev/actions).


Updates `chainguard-dev/actions` from 1.5.16 to 1.6.0
- [Release notes](https://github.com/chainguard-dev/actions/releases)
- [Commits](chainguard-dev/actions@eba358c...081e79e)

---
updated-dependencies:
- dependency-name: chainguard-dev/actions
  dependency-version: 1.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/update-ca-cert.yaml

@@ -121,7 +121,7 @@ jobs:
           fi
       - name: Setup gitsign
         if: steps.update.outputs.changed == 'true'
-        uses: chainguard-dev/actions/setup-gitsign@eba358c567c5b091e34187d905258baebdd2a4ec # v1.5.16
+        uses: chainguard-dev/actions/setup-gitsign@081e79ee578199ef583d4ca74edc376b50b9409c # v1.6.0
       - name: Create Pull Request
         if: steps.update.outputs.changed == 'true'
         uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0 # v8.1.0