Bump apple-actions/import-codesign-certs from 5 to 6

Bumps [apple-actions/import-codesign-certs](https://github.com/apple-actions/import-codesign-certs) from 5 to 6.
- [Release notes](https://github.com/apple-actions/import-codesign-certs/releases)
- [Commits](https://github.com/apple-actions/import-codesign-certs/compare/v5...v6)

---
updated-dependencies:
- dependency-name: apple-actions/import-codesign-certs
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/build-mac.yml

@@ -34,7 +34,7 @@ jobs:
       RUNTIME_ID: "osx-${{ inputs.architecture }}"
       WAIT_FOR_NOTARIZE: ${{ vars.WAIT_FOR_NOTARIZE == 'true' }}
     steps:    
-      - uses: apple-actions/import-codesign-certs@v5
+      - uses: apple-actions/import-codesign-certs@v6
         if: ${{ inputs.sign-app }}
         with: 
           p12-file-base64: ${{ secrets.DISTRIBUTION_SIGNING_CERT }}