Pin action versions to specific releases and fix deployment comment

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot

.github/workflows/label.yml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Label based on changed files
-        uses: actions/labeler@v5
+        uses: actions/labeler@v5.0.0
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           configuration-path: .github/labeler.yml

.github/workflows/link-check.yml

@@ -23,7 +23,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Check links in content directory
-        uses: gaurav-nelson/github-action-markdown-link-check@v1
+        uses: gaurav-nelson/github-action-markdown-link-check@v1.0.15
         with:
           use-quiet-mode: 'yes'
           use-verbose-mode: 'no'
@@ -32,7 +32,7 @@ jobs:
           check-modified-files-only: ${{ github.event_name == 'pull_request' && 'yes' || 'no' }}
 
       - name: Check links in root markdown files
-        uses: gaurav-nelson/github-action-markdown-link-check@v1
+        uses: gaurav-nelson/github-action-markdown-link-check@v1.0.15
         with:
           use-quiet-mode: 'yes'
           use-verbose-mode: 'no'

.github/workflows/preview.yml

@@ -24,7 +24,7 @@ jobs:
             
             const comment = `## 🚀 Preview Deployment
             
-            This pull request will be automatically deployed to Vercel when merged.
+            This pull request will be automatically deployed to Vercel.
             
             ### Preview Links
             - 📝 **Documentation**: Will be available once Vercel deployment completes