ci: bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
         python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -47,7 +47,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7

.github/workflows/docs.yml

@@ -23,7 +23,7 @@ jobs:
       (github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'success')
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           # For workflow_run, checkout the commit that triggered Release
           ref: ${{ github.event.workflow_run.head_sha || github.ref }}

.github/workflows/latest-deps.yml

@@ -16,7 +16,7 @@ jobs:
         python-version: ["3.10", "3.13"]
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7

.github/workflows/publish.yaml

@@ -22,7 +22,7 @@ jobs:
       name: pypi
       url: https://pypi.org/project/xarray_plotly
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           ref: ${{ github.ref_name }}
           fetch-depth: 0
@@ -46,7 +46,7 @@ jobs:
     if: github.event_name == 'push' && needs.publish.result == 'success'
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           ref: ${{ github.ref_name }}