chore(deps): bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

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

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

.github/workflows/ci.yaml

@@ -19,7 +19,7 @@ jobs:
     name: deno lint
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: denoland/setup-deno@main
         with:
           deno-version: ${{ matrix.deno-version }}
@@ -41,10 +41,10 @@ jobs:
     steps:
       - run: git config --global core.autocrlf false
         if: runner.os == 'Windows'
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           path: "./repo"
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: "vim-denops/denops.vim"
           path: "./denops.vim"

.github/workflows/uud.yaml

@@ -9,7 +9,7 @@ jobs:
   udd:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: denoland/setup-deno@v1
         with:
           deno-version: "1.x"