Update actions/checkout action to v4 (#198)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/pythonpackage.yml

@@ -10,7 +10,7 @@ jobs:
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11"]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
@@ -43,7 +43,7 @@ jobs:
   coverage:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache LLVM and Clang
         id: cache-llvm
         uses: actions/cache@v3
@@ -77,7 +77,7 @@ jobs:
       matrix:
         check: ["pylint", "pycodestyle", "black", "mypy"]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache LLVM and Clang
         id: cache-llvm
         uses: actions/cache@v3
@@ -102,7 +102,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache LLVM and Clang
         id: cache-llvm
         uses: actions/cache@v3
@@ -129,7 +129,7 @@ jobs:
       matrix:
         sphinx-version: ["three", "four"]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache LLVM and Clang
         id: cache-llvm
         uses: actions/cache@v3

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
     permissions:
       id-token: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v4
         with: