Update GitHub workflows to use actions/checkout@v5

Author: jwakely

.github/workflows/check-build.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 1
 

.github/workflows/check-pr.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         fetch-depth: 1
 

.github/workflows/deploy.yml

@@ -43,7 +43,7 @@ jobs:
 
     - if: ${{ steps.cache-repo.outputs.cache-hit != 'true' }}
       # Not using cached git repo, so clone it (with full history).
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         fetch-depth: 0
 
@@ -60,7 +60,7 @@ jobs:
     # Clone a fresh repo that has valid credentials to push to gh-pages.
     # The default fetch-depth:1 is OK for this step.
     - name: Clone repo again in order to push
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         ref: 'gh-pages'
         path: 'gh-pages'