chore(deps): bump actions/checkout from 2 to 4 (#221)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/docs-ci.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3.5.0
+      uses: actions/checkout@v4
 
     - name: Install Poetry
       run: pipx install poetry

.github/workflows/docs-publish.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v3.5.0
+      uses: actions/checkout@v4
 
     - name: Install Poetry
       run: pipx install poetry

.github/workflows/examples-ci.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3.5.0
+        uses: actions/checkout@v4
 
       - name: Install Poetry
         run: pipx install poetry

.github/workflows/lib-ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3.5.0
+        uses: actions/checkout@v4
 
       - name: Install Poetry
         run: pipx install poetry

.github/workflows/pre-ci.yml

@@ -11,7 +11,7 @@ jobs:
     name: Build & Run Pre Commit hooks to verify code structure, quality etc. from pre-commit hooks
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up python
         id: setup-python

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 

.github/workflows/release-please.yml

@@ -43,7 +43,7 @@ jobs:
           extra-files: |
             pyproject.toml
             src/libecalc/version.py
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Create vX.Y release branch (for simpler patching) - if normal release (not patching)
         if: ${{ steps.release.outputs.release_created && env.VERSIONING_STRATEGY != 'always-bump-patch' }}
         run: |