Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/docker.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
     - name: Checkout source
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Poke config
       run: |
         cp config/example.storage.yml config/storage.yml

.github/workflows/lint.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
     - name: Check out code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Setup ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
     - name: Check out code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Setup ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -40,7 +40,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
     - name: Check out code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Setup ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -64,7 +64,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
     - name: Check out code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Setup ruby
       uses: ruby/setup-ruby@v1
       with:

.github/workflows/tests.yml

@@ -18,7 +18,7 @@ jobs:
       OPENSTREETMAP_MEMCACHE_SERVERS: 127.0.0.1
     steps:
     - name: Checkout source
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Setup ruby
       uses: ruby/setup-ruby@v1
       with: