Update actions/checkout to v4

Author: tomwhite

.github/workflows/benchmark.yml

@@ -17,7 +17,7 @@ jobs:
     if: github.repository_owner == 'sgkit-dev'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0  # To fetch all commits to be able to generate benchmarks html
       - name: Set up Python ${{ matrix.python-version }}

.github/workflows/build-gpu.yml

@@ -20,7 +20,7 @@ jobs:
         python-version: ["3.10"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Run Nvidia-smi
         run: |

.github/workflows/build-numpy-1.yml

@@ -14,7 +14,7 @@ jobs:
         python-version: ["3.10", "3.11"]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
         python-version: ["3.10", "3.11", "3.12"]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:

.github/workflows/check-docs.yml

@@ -17,7 +17,7 @@ jobs:
         python-version: ["3.11"]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:

.github/workflows/docs.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:

.github/workflows/upstream.yml

@@ -17,7 +17,7 @@ jobs:
         python-version: ["3.10", "3.11"]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:

.github/workflows/validation.yml

@@ -15,7 +15,7 @@ jobs:
     if: github.repository_owner == 'sgkit-dev'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: google-github-actions/setup-gcloud@v0
       with:
         project_id: ${{ secrets.GCP_PROJECT_ID }}

.github/workflows/wheels.yml

@@ -21,7 +21,7 @@ jobs:
         python-version: ["3.10"]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
@@ -50,7 +50,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       # checkout repo to subdirectory to get access to scripts
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           path: sgkit-copy
       - name: Download artifacts
@@ -79,7 +79,7 @@ jobs:
         python-version: ["3.10"]
     steps:
       # checkout repo to subdirectory to get access to scripts
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           path: sgkit-copy
       - name: Download artifacts

.github/workflows/windows.yml

@@ -17,7 +17,7 @@ jobs:
         python-version: ["3.10"]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Miniconda with Python version ${{ matrix.python-version }}
       uses: conda-incubator/setup-miniconda@v2
       with: