build(deps): Bump gaurav-nelson/github-action-markdown-link-check

Bumps [gaurav-nelson/github-action-markdown-link-check](https://github.com/gaurav-nelson/github-action-markdown-link-check) from 1.0.13 to 1.0.15.
- [Release notes](https://github.com/gaurav-nelson/github-action-markdown-link-check/releases)
- [Commits](gaurav-nelson/github-action-markdown-link-check@1.0.13...1.0.15)

---
updated-dependencies:
- dependency-name: gaurav-nelson/github-action-markdown-link-check
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/linkchecker.yml

@@ -7,6 +7,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2.3.4
-      - uses: gaurav-nelson/github-action-markdown-link-check@1.0.13
+      - uses: gaurav-nelson/github-action-markdown-link-check@1.0.15
         with:
           folder-path: "docs"