chore(deps): bump actions/checkout from 2 to 4 (#36)

Author: dependabot[bot]

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
   format-with-stylua:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Cache cargo modules
         id: cache-cargo

.github/workflows/panvimdoc.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     name: pandoc to vimdoc
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: kdheepak/panvimdoc@main
         with:
           vimdoc: ${{ github.event.repository.name }}