update actions/checkout from v3 to v4

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: recursive
     - name: Install Rust
@@ -32,7 +32,7 @@ jobs:
 #  build-playground:
 #    runs-on: ubuntu-latest
 #    steps:
-#    - uses: actions/checkout@v3
+#    - uses: actions/checkout@v4
 #      with:
 #        submodules: recursive
 #    - name: Downgrade CMAKE
@@ -43,4 +43,4 @@ jobs:
 #        echo "/opt/cmake/bin" >> $GITHUB_PATH
 #    - name: Build Playground
 #      working-directory: ./crates/playground
-#      run: cargo build --examples
+#      run: cargo build --examples

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
     - name: Get current date
       id: date
       run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with: 
         submodules: recursive
     - uses: actions-rs/toolchain@v1