Bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -21,7 +21,7 @@ jobs:
     name: Build & verify python package
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0 # needed for setuptools_scm version determination
       - uses: hynek/build-and-inspect-python-package@v2
@@ -77,7 +77,7 @@ jobs:
         new_docker_api_client: [true, false]
     runs-on: ${{ matrix.platform }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0 # needed for goreleaser version determination
       - name: Download pre-built packages
@@ -151,7 +151,7 @@ jobs:
         new_docker_api_client: [true, false]
     timeout-minutes: 25
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0 # needed for goreleaser version determination
       - name: Login to Docker Hub
@@ -192,7 +192,7 @@ jobs:
       contents: write
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0 # needed for goreleaser version determination
       - name: Download pre-built packages

.github/workflows/codeql.yml

@@ -40,7 +40,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/docs.yaml

@@ -9,7 +9,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-python@v6
         with:
           python-version: '3.13'

.github/workflows/llm-docs.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Compile llms.txt
       run: |

.github/workflows/pypi-package.yaml

@@ -17,7 +17,7 @@ jobs:
     name: Build & verify package
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0 # needed for setuptools_scm version determination
       # HACK: for now, disable local versions so we can push to Test PyPI on main