Bump actions/checkout from 3.6.0 to 4.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.6.0 to 4.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3.6.0...v4.0.0)

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

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

.github/workflows/build.yml

@@ -9,7 +9,7 @@ jobs:
     name: Build Docker image with pyziomki's dependencies
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3.6.0
+      - uses: actions/checkout@v4.0.0
       - name: Build doctools docker image
         uses: docker/build-push-action@v4
         with:

.github/workflows/docker_latest.yaml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
 
       - name: Log in to Docker Hub
         uses: docker/login-action@v2

.github/workflows/docker_tag.yaml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
 
       - name: Docker meta
         id: meta
@@ -47,7 +47,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
 
       - name: Docker meta
         id: meta