chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/default.yml

@@ -7,7 +7,7 @@ jobs:
     name: stylua
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: JohnnyMorganz/stylua-action@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -17,14 +17,14 @@ jobs:
     name: luacheck
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lunarmodules/luacheck@v1
         with:
           args: . --std luajit --globals vim --max-line-length 150 --no-config
   deno_fmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: denoland/setup-deno@v2
         with:
           deno-version: 2.5.6 # Run with latest stable Deno.
@@ -34,6 +34,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Actions Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Spell Check Repo
         uses: crate-ci/[email protected]

.github/workflows/update_lockfile.yml

@@ -11,7 +11,7 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: rhysd/action-setup-vim@v1
         with: