deps(ci): bump tailscale/github-action from 4.0.2 to 4.0.3 (#537)

Bumps [tailscale/github-action](https://github.com/tailscale/github-action) from 4.0.2 to 4.0.3.
- [Release notes](https://github.com/tailscale/github-action/releases)
- [Commits](tailscale/github-action@aa60431...3a21736)

---
updated-dependencies:
- dependency-name: tailscale/github-action
  dependency-version: 4.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/codecov.yml

@@ -21,7 +21,7 @@ jobs:
 
       - name: Connect to Tailnet
         if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository
-        uses: tailscale/github-action@aa604318b61e5b25107287e0d07db6a08b3e72c0 #v4.0.2
+        uses: tailscale/github-action@3a217367cadc62d7600a77470ffe542e2313e6b9 #v4.0.3
         with:
           args: --accept-dns=true
           oauth-client-id: ${{ secrets.TS_OAUTH_CLIENT_ID }}