ci: bump actions/checkout tag

Author: madebr

.github/workflows/main.yml

@@ -23,7 +23,7 @@ jobs:
       if: contains(matrix.platform.name, 'MinGW')
       run:  choco install ninja
     - name: Get PhysicsFS sources
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Configure CMake
       run: cmake -B build ${{ matrix.platform.flags }}
     - name: Build

.github/workflows/os2.yml

@@ -6,7 +6,7 @@ jobs:
   os2:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: open-watcom/setup-watcom@v0
       - name: Build physfs.dll
         run: |