chore(dependabot): bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/markdownlint.yml

@@ -16,7 +16,7 @@ jobs:
     name: Markdownlint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: DavidAnson/markdownlint-cli2-action@v20
         with:
           globs: "**/*.md"

.github/workflows/nvim-type-check.yml

@@ -12,5 +12,5 @@ jobs:
     name: nvim type check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: stevearc/nvim-typecheck-action@v2

.github/workflows/panvimdoc.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     name: README.md to vimdoc
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - run: git pull # fix failure when multiple commits are pushed in succession
       - run: mkdir -p doc
 

.github/workflows/stylua.yml

@@ -12,7 +12,7 @@ jobs:
     name: Stylua
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: JohnnyMorganz/stylua-action@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}