CI: Update to actions/checkout@v4

Author: lazka

.github/workflows/build.yml

@@ -41,7 +41,7 @@ jobs:
       run: |
         echo "$CONTEXT"
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - uses: actions/setup-python@v4
       with:
@@ -121,7 +121,7 @@ jobs:
         Get-PSDrive -PSProvider FileSystem
         Get-CIMInstance -Class Win32_Processor | Select-Object -Property Name
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - uses: actions/setup-python@v4
       with:

.github/workflows/maint.yml

@@ -38,7 +38,7 @@ jobs:
       run: |
         echo "$CONTEXT"
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - uses: actions/setup-python@v4
       with:

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
         python-version: ['3.10', '3.11', '3.12']
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with: