Bump lycheeverse/lychee-action from 1.5.0 to 1.8.0

Bumps [lycheeverse/lychee-action](https://github.com/lycheeverse/lychee-action) from 1.5.0 to 1.8.0.
- [Release notes](https://github.com/lycheeverse/lychee-action/releases)
- [Commits](https://github.com/lycheeverse/lychee-action/compare/v1.5.0...v1.8.0)

---
updated-dependencies:
- dependency-name: lycheeverse/lychee-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/check-urls.yml

@@ -16,7 +16,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Check link validity
-        uses: lycheeverse/lychee-action@v1.5.0
+        uses: lycheeverse/lychee-action@v1.8.0
 
       - name: Fail if there were link errors
         run: exit ${{ steps.lc.outputs.exit_code }}