Pin checkout to v4 and add explicit Rust toolchain step in ci and render workflows

Author: mre

.github/workflows/ci.yml

@@ -8,7 +8,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Prevent file change
         uses: xalvarez/prevent-file-change-action@v1

.github/workflows/render.yml

@@ -7,20 +7,23 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    
+
     permissions:
       # Give the default GITHUB_TOKEN write permission to commit and push the
       # added or changed files to the repository.
       contents: write
 
     steps:
-      - uses: actions/checkout@v3
-        
+      - uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
       - name: Render list
         run: make render
         env:
           GITHUB_TOKEN: ${{ github.token }}
-        
+
       - uses: stefanzweifel/git-auto-commit-action@v4.1.2
         with:
           commit_message: Commit list