Use forked md-link-check

Author: szg251

.github/workflows/md-link-check.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@master
-      - uses: gaurav-nelson/github-action-markdown-link-check@v1
+      - uses: tcort/github-action-markdown-link-check@v1
         with:
           use-verbose-mode: 'yes'
           config-file: '.mlc_config.json'