CI: Update nosborn/github-action-markdown-cli to v3.5.0

Pin the action to the commit for v3.5.0.

Also, update the config to ignore introduction.md because its links will
always be broken as it is a partial file used to generate the complete
documentation.

Author: RytoEX

.github/workflows/lint.yml

@@ -19,6 +19,7 @@ jobs:
       - name: Generate docs
         run: cd docs && ./build_docs.sh
       - name: Run markdownlint-cli
-        uses: nosborn/github-action-markdown-cli@v3.0.1
+        uses: nosborn/github-action-markdown-cli@508d6cefd8f0cc99eab5d2d4685b1d5f470042c1 # v3.5.0
         with:
           files: .
+          ignore_files: docs/docs/partials/introduction.md