Fix actions/checkout@v4 (#254)

.github/workflows/ci.yml

@@ -19,35 +19,35 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Build and Test
         run: bash ./ci/linux/build-test-x86.sh
   x86_64-linux:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Build and Test
         run: bash ./ci/linux/build-test-x86_64.sh
 #TODO  x86-64-linux-O0:
 #    runs-on: ubuntu-latest
 #    steps:
 #      - name: Checkout
-#        uses: actions/checkout@v2
+#        uses: actions/checkout@v4
 #      - name: Build and Test
 #        run: bash ./ci/linux/build-test-x86_64.sh -O0
   x86-64-linux-O1:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Build and Test
         run: bash ./ci/linux/build-test-x86_64.sh -O1
   x86-64-linux-O2:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Build and Test
         run: bash ./ci/linux/build-test-x86_64.sh -O2
 #  x86-64-linux-O3:
@@ -61,21 +61,21 @@ jobs:
     runs-on: macos-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Build and Test
         run: bash ./ci/macos/build-test-x86_64.sh
   jvm:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Build and Test
         run: bash ./ci/jvm/build-test-jvm.sh
   wasm:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Build and Test
         run: bash ./ci/wasm/build-test-wasm.sh