switch to lychee for link checking

.github/workflows/check-markdown-links.yml

@@ -1,14 +1,20 @@
-name: Check Markdown links
+name: Link Checker
 
 on:
-  push:
-  schedule:
-  - cron: "0 0 * * *"
+  pull_request:
   workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * 0"
 
 jobs:
-  markdown-link-check:
+  link-checker:
+    permissions:
+      contents: read
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
-    - uses: gaurav-nelson/github-action-markdown-link-check@v1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
+
+      - name: Link Checker
+        uses: lycheeverse/lychee-action@82202e5e9c2f4ef1a55a3d02563e1cb6041e5332 # v2.4.1