Apply suggestions from code review

Author: lwasser

.github/workflows/build-site.yml

@@ -34,7 +34,7 @@ jobs:
 
       - name: Check links with lychee
         id: lychee
-        uses: lycheeverse/lychee-action@v2.6.0
+        uses: lycheeverse/lychee-action@01a5c94d8e012550040658854b90a7a7301e75ca #v2.6.0
         with:
           fail: true
           args: --verbose --no-progress _site/*.html

.github/workflows/deploy-gh-pages.yml

@@ -48,7 +48,7 @@ jobs:
           JEKYLL_ENV: production
       - name: Upload artifact
         # Automatically uploads an artifact from the './_site' directory by default
-        uses: actions/upload-pages-artifact@v4
+        uses: actions/upload-pages-artifact@7b1f4a764d45c48632c6b24a0339c27f5614fb0b #v4
 
   # Deployment job
   deploy:

.github/workflows/linkcheck.yml

@@ -30,7 +30,7 @@ jobs:
 
       - name: Link Checker
         id: lychee
-        uses: lycheeverse/lychee-action@v2.6.0
+        uses: lycheeverse/lychee-action@01a5c94d8e012550040658854b90a7a7301e75ca #v2.6.0
         with:
           args: --verbose --no-progress _site/*.html
         env: