Bump the actions group across 1 directory with 4 updates

Bumps the actions group with 4 updates in the / directory: [actions/checkout](https://github.com/actions/checkout), [actions/upload-artifact](https://github.com/actions/upload-artifact), [actions/download-artifact](https://github.com/actions/download-artifact) and [actions/cache](https://github.com/actions/cache).


Updates `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)

Updates `actions/upload-artifact` from 5 to 6
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

Updates `actions/download-artifact` from 6 to 7
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v6...v7)

Updates `actions/cache` from 4 to 5
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: actions/download-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: actions/cache
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/autofix.yml

@@ -12,7 +12,7 @@ jobs:
     name: Autoupdate changelog entry and headers
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: actions/setup-python@v6

.github/workflows/check_changelog.yml

@@ -13,7 +13,7 @@ jobs:
     name: Check towncrier entry in doc/changes/dev/
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: scientific-python/action-towncrier-changelog@v2

.github/workflows/codeql-analysis.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         persist-credentials: false
 

.github/workflows/credit.yml

@@ -17,7 +17,7 @@ jobs:
       GH_TOKEN: ${{ github.token }}
       GITHUB_TOKEN: ${{ github.token }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: true
       - uses: actions/setup-python@v6

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
   package:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: actions/setup-python@v6
@@ -28,7 +28,7 @@ jobs:
           pip install build twine
       - run: python -m build --sdist --wheel
       - run: twine check --strict dist/*
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: dist
           path: dist
@@ -43,7 +43,7 @@ jobs:
       name: pypi
       url: https://pypi.org/p/mne
     steps:
-      - uses: actions/download-artifact@v6
+      - uses: actions/download-artifact@v7
         with:
           name: dist
           path: dist

.github/workflows/spec_zero.yml

@@ -22,7 +22,7 @@ jobs:
       GH_TOKEN: ${{ github.token }}
       GITHUB_TOKEN: ${{ github.token }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: true
       - name: Triage SSH

.github/workflows/tests.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 3
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: actions/setup-python@v6
@@ -92,7 +92,7 @@ jobs:
             python: '3.10'
             kind: old
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -165,7 +165,7 @@ jobs:
         run: MNE_SKIP_TESTING_DATASET_TESTS=true pytest -m "not (ultraslowtest or pgtest)" --tb=short --cov=mne --cov-report xml -vv -rfE mne/
         if: matrix.kind == 'minimal'
       - run: ./tools/get_testing_version.sh
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           key: ${{ env.TESTING_VERSION }}
           path: ~/mne_data