build(deps): bump actions/checkout from 5 to 6 (#136)

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>

Author: dependabot[bot]

.github/workflows/R-CMD-check-schedule.yaml

@@ -27,7 +27,7 @@ jobs:
         R_KEEP_PKG_SOURCE: yes
 
       steps:
-        - uses: actions/checkout@v5
+        - uses: actions/checkout@v6
 
         - uses: r-lib/actions/setup-pandoc@v2
 

.github/workflows/R-CMD-check.yaml

@@ -30,7 +30,7 @@ jobs:
       R_KEEP_PKG_SOURCE: yes
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: r-lib/actions/setup-pandoc@v2
 

.github/workflows/draft-pdf.yaml

@@ -12,7 +12,7 @@ jobs:
     name: Paper Draft
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Build draft PDF
         uses: openjournals/openjournals-draft-action@master
         with:

.github/workflows/test-coverage.yaml

@@ -16,7 +16,7 @@ jobs:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: r-lib/actions/setup-r@v2
         with:

.github/workflows/update-citation-cff.yaml

@@ -22,7 +22,7 @@ jobs:
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: r-lib/actions/setup-r@v2
       - uses: r-lib/actions/setup-r-dependencies@v2
         with: