Bump actions/checkout from 3 to 4 (#534)

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
           - id: protoc
             name: Check protobuf files match
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v4
         id: python

.github/workflows/docker.yml

@@ -25,7 +25,7 @@ jobs:
     steps:
       -
         name: Checkout source code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       -
         name: Log in to docker hub
         uses: docker/login-action@v3.0.0

.github/workflows/release-drafter.yml

@@ -20,7 +20,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       # Update version number in setup.py
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Calculate version
         id: version
         run: |

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
     name: Build and publish to PyPi
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v4
         with: