ci: Update `checkout` to v3

.github/workflows/ci.yml

@@ -29,9 +29,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Install rapidjson
-      uses: actions/checkout@master
+      uses: actions/checkout@v3
       with:
         repository: Tencent/rapidjson
         path: rapidjson
@@ -84,7 +84,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Add msbuild to PATH
       uses: microsoft/setup-msbuild@v1.0.2
     - name: Setup Windows SDK
@@ -119,7 +119,7 @@ jobs:
 
     permissions: read-all
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Add msbuild to PATH
       uses: microsoft/setup-msbuild@v1.0.2
     - uses: ilammy/msvc-dev-cmd@v1
@@ -138,7 +138,7 @@ jobs:
 
     permissions: read-all
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Install cppcheck
       run: sudo apt install -y cppcheck
     - name: Run cppcheck