CI: (deps): 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]>

.github/workflows/backport-prs.yml

@@ -16,7 +16,7 @@ jobs:
     if: github.event.pull_request.merged && contains( github.event.pull_request.labels.*.name, 'backport' )
     steps:
       - name: Checkout PR HEAD
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 100

.github/workflows/cffcheck.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out a copy of the repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Check validity of CITATION.cff
         uses: citation-file-format/[email protected]

.github/workflows/code-analysis.yml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v2

.github/workflows/docs-conda.yml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
     - name: Checkout source
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 150
         fetch-tags: true

.github/workflows/docs.yml

@@ -42,7 +42,7 @@ jobs:
 
     steps:
     - name: Checkout source
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 150
         fetch-tags: true

.github/workflows/linting.yml

@@ -14,7 +14,7 @@ jobs:
     name: Flake8
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python 3
         uses: actions/setup-python@v4

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
     name: Build Release Packages
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 10
         fetch-tags: true

.github/workflows/tests-conda.yml

@@ -33,7 +33,7 @@ jobs:
 
     steps:
     - name: Checkout source
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 150
         fetch-tags: true

.github/workflows/tests-pypi.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Checkout source
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 150
         fetch-tags: true

.github/workflows/unstable-builds.yml

@@ -17,7 +17,7 @@ jobs:
       result: ${{ steps.tests.outcome }}
     steps:
     - name: Checkout source
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 150
         fetch-tags: true
@@ -57,7 +57,7 @@ jobs:
       result: ${{ steps.build.outcome }}
     steps:
     - name: Checkout source
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 150
         fetch-tags: true