build(deps): bump linkerd/dev in /.github/actions/helm-publish

Bumps [linkerd/dev](https://github.com/linkerd/dev) from 48 to 49.
- [Release notes](https://github.com/linkerd/dev/releases)
- [Commits](linkerd/dev@v48...v49)

---
updated-dependencies:
- dependency-name: linkerd/dev
  dependency-version: '49'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/actions/helm-publish/action.yml

@@ -5,7 +5,7 @@ runs:
   steps:
   - name: Set up Cloud SDK
     uses: 'google-github-actions/setup-gcloud@aa5489c8933f4cc7a4f7d45035b3b1440c9c10db'
-  - uses: linkerd/dev/actions/setup-tools@v48
+  - uses: linkerd/dev/actions/setup-tools@v49
   - shell: bash
     run: |
       mkdir -p target/helm