build(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] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
   ci:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Install Dependencies
         run: sudo apt-get install gettext

.github/workflows/deploy-gh-page.yml

@@ -9,7 +9,7 @@ jobs:
   cd:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Install Dependencies
         run: sudo apt-get install gettext

.github/workflows/py312-sync-cpython.yml

@@ -14,7 +14,7 @@ jobs:
       VERSION: "3.12"
       BRANCH: "cron/sync/3.12"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           ref: ${{ env.VERSION }}
 

.github/workflows/summarize_progress.yml

@@ -13,7 +13,7 @@ jobs:
         # added or changed files to the repository.
         contents: write
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Install poetry
         uses: abatilo/actions-poetry@v3