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](https://github.com/actions/checkout/compare/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.yml

@@ -16,7 +16,7 @@ jobs:
       OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Cache Docker layers
         uses: actions/cache@v2

.github/workflows/codeql.yml

@@ -30,7 +30,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/deploy_gh-pages.yml

@@ -12,7 +12,7 @@ jobs:
     name: Deploy to GitHub Pages
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-node@v3
         with:
           node-version: 18

.github/workflows/lint.yml

@@ -17,7 +17,7 @@ jobs:
           - "3.9"
           - "3.10"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install poetry
         run: |
           pipx install poetry==$POETRY_VERSION

.github/workflows/pre-release.yml

@@ -18,7 +18,7 @@ jobs:
     if: ${{ (github.event.pull_request.merged == true) && contains(github.event.pull_request.labels.*.name, 'pre-release') }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install poetry
         run: pipx install poetry==$POETRY_VERSION
       - name: Set up Python 3.10

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
     if: ${{ (github.event.pull_request.merged == true) && contains(github.event.pull_request.labels.*.name, 'Release') }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install poetry
         run: pipx install poetry==$POETRY_VERSION
       - name: Set up Python 3.10

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
     env:
       OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install poetry
         run: pipx install poetry==$POETRY_VERSION
       - name: Set up Python ${{ matrix.python-version }}