Update actions/checkout action to v4

.github/workflows/docs.yml

@@ -28,7 +28,7 @@ jobs:
     name: Docs
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Python
       uses: actions/setup-python@v4

.github/workflows/lint.yml

@@ -17,7 +17,7 @@ jobs:
     name: Lint
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: pre-commit cache
       uses: actions/cache@v3

.github/workflows/test-cygwin.yml

@@ -36,7 +36,7 @@ jobs:
           git config --global core.autocrlf input
 
       - name: Checkout Pillow
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install Cygwin
         uses: cygwin/cygwin-install-action@v4

.github/workflows/test-docker.yml

@@ -59,7 +59,7 @@ jobs:
     name: ${{ matrix.docker }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Build system information
       run: python3 .github/workflows/system-info.py

.github/workflows/test-mingw.yml

@@ -34,7 +34,7 @@ jobs:
 
     steps:
       - name: Checkout Pillow
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up shell
         run: echo "C:\msys64\usr\bin\" >> $env:GITHUB_PATH

.github/workflows/test-valgrind.yml

@@ -37,7 +37,7 @@ jobs:
     name: ${{ matrix.docker }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Build system information
       run: python3 .github/workflows/system-info.py

.github/workflows/test-windows.yml

@@ -32,16 +32,16 @@ jobs:
 
     steps:
     - name: Checkout Pillow
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Checkout cached dependencies
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: python-pillow/pillow-depends
         path: winbuild\depends
 
     - name: Checkout extra test images
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: python-pillow/test-images
         path: Tests\test-images

.github/workflows/test.yml

@@ -48,7 +48,7 @@ jobs:
     name: ${{ matrix.os }} Python ${{ matrix.python-version }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4