use checkout@v3

NodeJS 12 actions are deprecated, use a newer checkout action instead

Author: UnixY2K

.github/workflows/build.yml

@@ -44,7 +44,7 @@ jobs:
           }
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: submodule
       run: git submodule update --init --recursive
     - name: extra_path

.github/workflows/subdir_example.yml

@@ -27,7 +27,7 @@ jobs:
           }
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: configure
       shell: cmake -P {0}
       run: |