Bump actions/checkout from 2 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -30,7 +30,7 @@ jobs:
       matrix:
         python-version: ["3.11"]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with:

.github/workflows/docker-pr-deploy.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: ${{ inputs.repository }}
           ref: ${{ inputs.ref }}

.github/workflows/docker-pr.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v6
 
       - name: Build Docker image
         run: docker build -t eventyay-talk:${{ github.sha }} .

.github/workflows/docker.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       -
         name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       -
         name: Set up QEMU
         uses: docker/setup-qemu-action@v2

.github/workflows/docs.yml

@@ -19,7 +19,7 @@ jobs:
     name: Spellcheck
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version-file: ".github/workflows/python-version.txt"
@@ -56,7 +56,7 @@ jobs:
     name: Linkcheck
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version-file: ".github/workflows/python-version.txt"

.github/workflows/gh-pages-deploy.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v4

.github/workflows/strings.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Check that translation files compile
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with:

.github/workflows/style.yml

@@ -24,7 +24,7 @@ jobs:
     name: HTML checks
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version-file: ".github/workflows/python-version.txt"

.github/workflows/tests.yml

@@ -47,7 +47,7 @@ jobs:
         ports:
           - 5432:5432
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with: