ci(dependabot): bump actions/checkout from 5 to 6 (#248)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [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>
Co-authored-by: Talley Lambert <talley.lambert@gmail.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     name: Check Manifest
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: pip3 install check-manifest && check-manifest
 
   test:
@@ -35,7 +35,7 @@ jobs:
             python-version: "3.13"
             extra: "plot"
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: astral-sh/setup-uv@v7
         with:
@@ -77,11 +77,11 @@ jobs:
         # note: hard-coding pymmcore-plus/ org for now
         repo: ["pymmcore-plus", "pymmcore-widgets"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           repository: pymmcore-plus/${{ matrix.repo }}
           fetch-depth: 0
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           path: useq-schema
           fetch-depth: 0
@@ -112,7 +112,7 @@ jobs:
       id-token: write
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: astral-sh/setup-uv@v7

.github/workflows/docs.yml

@@ -8,7 +8,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@v7
 
       - name: Test build