Bump actions/checkout from 2 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...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>

Author: dependabot[bot]

.github/workflows/buildwheels.yml

@@ -18,7 +18,7 @@ jobs:
   debug_build_ok:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
           fetch-depth: 0  # https://github.com/pypa/setuptools_scm/issues/480
@@ -28,7 +28,7 @@ jobs:
   zenodo_json:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: notiz-dev/github-action-json-property@release
         with: 
           path: '.zenodo.json'
@@ -44,7 +44,7 @@ jobs:
         os: [ubuntu-latest, ubuntu-24.04-arm, macos-14, macos-15, macos-15-intel, windows-latest]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
           fetch-depth: 0
@@ -95,7 +95,7 @@ jobs:
         os: [ubuntu-latest, ubuntu-24.04-arm, macos-14, macos-15, macos-15-intel, windows-latest]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
           fetch-depth: 0
@@ -132,7 +132,7 @@ jobs:
       name: Check if todos are annotated
 
       steps:
-        - uses: actions/checkout@v4
+        - uses: actions/checkout@v6
           with:
             submodules: recursive
             fetch-depth: 0
@@ -164,7 +164,7 @@ jobs:
     name: Make source distribution
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
         submodules: recursive

.github/workflows/codecov.yml

@@ -10,7 +10,7 @@ jobs:
   codecov:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4.2.2
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
           fetch-depth: 0

.github/workflows/conda.yml

@@ -14,7 +14,7 @@ jobs:
         python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
         with:
             submodules: recursive
             fetch-depth: 0  # https://github.com/pypa/setuptools_scm/issues/480

.github/workflows/forlint.yml

@@ -10,7 +10,7 @@ jobs:
    lint:
       runs-on: ubuntu-latest
       steps:
-         - uses: actions/checkout@v2
+         - uses: actions/checkout@v6
          - uses: NOAA-GFDL/simple_lint@v3
            with:
              failure: true

.github/workflows/pdoc.yml

@@ -17,7 +17,7 @@ jobs:
         platform: [ubuntu-latest]
     runs-on: ${{ matrix.platform }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
           persist-credentials: false

.github/workflows/pre-commit.yml

@@ -6,7 +6,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
       - name: Set up Python 3.10
         uses: actions/setup-python@v1
         with:

.github/workflows/pylint.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         submodules: recursive
         fetch-depth: 0

.github/workflows/readme_listings.yml

@@ -16,7 +16,7 @@ jobs:
   julia:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
 
@@ -44,7 +44,7 @@ jobs:
   python:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
 
@@ -71,7 +71,7 @@ jobs:
   fortran:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
 
@@ -112,7 +112,7 @@ jobs:
     runs-on: ubuntu-22.04
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
 

.github/workflows/urlcheck.yml

@@ -12,7 +12,7 @@ jobs:
   url-check:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4.1.6
+      - uses: actions/checkout@v6
       - uses: urlstechie/urlchecker-action@master
         with:
           file_types: .md,.py,.json,.ipynb,.yaml,.yml,.toml,.c,.hpp,.cpp,.F90,.f90,.txt,.dat,.cff