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]>

.github/workflows/hassfest.yaml

@@ -8,5 +8,5 @@ jobs:
   validate:
     runs-on: "ubuntu-latest"
     steps:
-      - uses: "actions/checkout@v2"
+      - uses: "actions/checkout@v4"
       - uses: home-assistant/actions/hassfest@master

.github/workflows/python-app.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python 3.8
       uses: actions/setup-python@v5
       with:

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
       contents: write
     steps:
       - name: 📥 Checkout the repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: 🛠️ Set up Python
         uses: actions/setup-python@v5

.github/workflows/validate_hacs.yaml

@@ -8,7 +8,7 @@ jobs:
   validate:
     runs-on: "ubuntu-latest"
     steps:
-      - uses: "actions/checkout@v2"
+      - uses: "actions/checkout@v4"
       - name: HACS validation
         uses: "hacs/action@main"
         with: