Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "📥 Check-out"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: "🧰 Install Python"
         uses: actions/setup-python@v4
         with:
@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "📥 Check-out"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: "🧰 Install Python"
         uses: actions/setup-python@v4
         with:
@@ -51,7 +51,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "📥 Check-out"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: "🧰 Install Python"
         uses: actions/setup-python@v4
         with:
@@ -81,7 +81,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "📥 Check-out"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: "🏷️ Get version tag"
         id: get-version
         run: echo ::set-output name=tag::${GITHUB_REF/refs\/tags\//}