actions: consistently use checkout@v4

this was already in use by "Gather Environments" and "Build
Environments", but neither in "Create Release" nor "Yarn Linting"
nor "cpplint".

.github/workflows/build.yml

@@ -130,7 +130,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/2')
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Get tags
         run: git fetch --force --tags origin

.github/workflows/cpplint.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v5
         with:

.github/workflows/yarnlint.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Setup Node.js and yarn
         uses: actions/setup-node@v3
         with: