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] <[email protected]>

Author: dependabot[bot]

.github/workflows/continuous-integration.yml

@@ -53,7 +53,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
         with:
           fetch-depth: 2
 
@@ -106,7 +106,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
         with:
           fetch-depth: 2
 

.github/workflows/lint.yaml

@@ -10,7 +10,7 @@ jobs:
 
         steps:
             - name: "Checkout"
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: "DOCtor-RST"
               uses: docker://oskarstark/doctor-rst

.github/workflows/static-analysis.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"