Update lycheeverse/lychee-action digest to a8c4c7c

Author: xdev-renovate

.github/workflows/broken-links.yml

@@ -18,7 +18,7 @@ jobs:
 
       - name: Link Checker
         id: lychee
-        uses: lycheeverse/lychee-action@885c65f3dc543b57c898c8099f4e08c8afd178a2 # v2
+        uses: lycheeverse/lychee-action@a8c4c7cb88f0c7386610c35eb25108e448569cb0 # v2
         with:
           fail: false # Don't fail on broken links, create an issue instead