fix: add --root-dir to lychee args for v2.8.0 compatibility

Co-authored-by: commjoen <1457214+commjoen@users.noreply.github.com>

Author: Copilot

.github/workflows/link_checker.yml

@@ -20,5 +20,5 @@ jobs:
         id: lychee
         uses: lycheeverse/lychee-action@v2.8.0
         with:
-          args: --exclude-all-private --exclude-path "src/main/resources/templates/about.html" --exclude-path ".lycheeignore" -r 2 './**/*.md' './**/*.html'
+          args: --exclude-all-private --exclude-path "src/main/resources/templates/about.html" --exclude-path ".lycheeignore" --root-dir . -r 2 './**/*.md' './**/*.html'
           fail: true