chore(ci.deps): bump actions/checkout in the actions-dependencies group

Bumps the actions-dependencies group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `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
  dependency-group: actions-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/lint_code.yml

@@ -5,7 +5,7 @@ jobs:
   luacheck:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lunarmodules/luacheck@v1
         with:
           args: . --std luajit --max-line-length 150 --no-config --globals vim _debugging _command_panel _flash_esc_or_noh _telescope_collections _toggle_inlayhint _toggle_virtuallines _toggle_lazygit _select_chat_model

.github/workflows/style_check.yml

@@ -5,7 +5,7 @@ jobs:
   stylua:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: JohnnyMorganz/stylua-action@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/update_flake.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Nix
         uses: DeterminateSystems/determinate-nix-action@v3

.github/workflows/update_lockfile.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Required to count the commits