Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
         options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Use Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6

.github/workflows/codeql.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v4

.github/workflows/publish-version.yml

@@ -16,7 +16,7 @@ jobs:
       doTag: ${{ steps.checkTag.outputs.doTag }}
       newVersion: ${{ steps.checkTag.outputs.newVersion }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Use Python 3.10
         uses: actions/setup-python@v6
         with:
@@ -46,7 +46,7 @@ jobs:
       - get-current-version
     if: ${{ needs.get-current-version.outputs.doTag == 'true' }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Push the new tag
         run: |
           git config --global user.name "DiamondLightSource-build-server"
@@ -64,7 +64,7 @@ jobs:
       - get-current-version
     if: ${{ needs.get-current-version.outputs.doTag == 'true' }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Python 3.10
         uses: actions/setup-python@v6
         with:

.github/workflows/test.yml

@@ -18,7 +18,7 @@ jobs:
     name: Static Analysis
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Python 3.10
         uses: actions/setup-python@v6
         with:
@@ -35,7 +35,7 @@ jobs:
     name: Build package
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Python 3.10
         uses: actions/setup-python@v6
         with:
@@ -53,7 +53,7 @@ jobs:
     name: Build package
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Download ISPyB DB schema v${{ env.ISPYB_DATABASE_SCHEMA }} for tests
         run: |
           mkdir database

.github/workflows/version-bump.yml

@@ -34,7 +34,7 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Python 3.10
         uses: actions/setup-python@v6
         with: