Bump actions/checkout from 5 to 6 (#1534)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/codeql-analysis.yml

@@ -32,7 +32,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # We must fetch at least the immediate parents so that if this is
           # a pull request then we can checkout the head.

.github/workflows/docs.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Needed for setuptools_scm to work correctly
 

.github/workflows/gemini-review.yml

@@ -41,7 +41,7 @@ jobs:
           permission-pull-requests: "write"
 
       - name: "Checkout repository"
-        uses: "actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8" # ratchet:actions/checkout@v5
+        uses: "actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd" # ratchet:actions/checkout@v5
 
       - name: "Run Gemini pull request review"
         uses: "google-github-actions/run-gemini-cli@v0" # ratchet:exclude

.github/workflows/quality.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Needed for setuptools_scm to work correctly
 

.github/workflows/tests.yml

@@ -21,7 +21,7 @@ jobs:
         shell: bash
     steps:
       - name: Check out
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Needed for setuptools_scm to work correctly
       - name: Install uv

.github/workflows/typecheck.yml

@@ -22,7 +22,7 @@ jobs:
         shell: bash
     steps:
       - name: Check out
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Needed for setuptools_scm to work correctly