github-actions: bump umbrelladocs/action-linkspector from 1.4.1 to 1.5.1 (openthread#13147)

Bumps [umbrelladocs/action-linkspector](https://github.com/umbrelladocs/action-linkspector) from 1.4.1 to 1.5.1.
- [Release notes](https://github.com/umbrelladocs/action-linkspector/releases)
- [Commits](UmbrellaDocs/action-linkspector@37c85bc...963b626)

---
updated-dependencies:
- dependency-name: umbrelladocs/action-linkspector
  dependency-version: 1.5.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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/build.yml

@@ -79,7 +79,7 @@ jobs:
 
     - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
     - name: Run linkspector
-      uses: umbrelladocs/action-linkspector@37c85bcde51b30bf929936502bac6bfb7e8f0a4d # v1.4.1
+      uses: umbrelladocs/action-linkspector@963b6264d7de32c904942a70b488d3407453049e # v1.5.1
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
         reporter: github-pr-review