ci: 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/build_pypi.yml

@@ -50,7 +50,7 @@ jobs:
       - uses: hmarr/[email protected]
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ inputs.ref }}
 

.github/workflows/docs.yml

@@ -8,7 +8,7 @@ jobs:
   deploy_docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Cache pip deps
         uses: actions/[email protected]

.github/workflows/lint.yml

@@ -6,7 +6,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: psf/black@stable
         with:
           options: "--check --skip-string-normalization"

.github/workflows/release-cut-off-release-branch.yml

@@ -31,7 +31,7 @@ jobs:
       - uses: hmarr/[email protected]
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           token: ${{ secrets.GIT_PAT }}
           ref: ${{ inputs.ref }}

.github/workflows/release-set-version.yml

@@ -33,7 +33,7 @@ jobs:
       - uses: hmarr/[email protected]
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           token: ${{ secrets.GIT_PAT }}
           ref: ${{ inputs.branch }}

.github/workflows/tests.yml

@@ -32,7 +32,7 @@ jobs:
           - 3.9
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/[email protected]
         with: