Fix link checker workflow - use stable action versions

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

.github/workflows/check-links.yml

@@ -21,7 +21,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Check links with lychee
-        uses: lycheeverse/lychee-action@2b973e86fc5181cd4fdfd5829efc58d4dd49a2c4 # v2.0.2
+        uses: lycheeverse/lychee-action@v2
         with:
           # Scan all markdown and MDX files in content directory, plus root README
           args: >-
@@ -38,7 +38,7 @@ jobs:
 
       - name: Create Issue on Failure
         if: failure()
-        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        uses: actions/github-script@v7
         with:
           script: |
             github.rest.issues.create({