Bump actions/checkout from 3.6.0 to 4.0.0 (#52)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.6.0 to 4.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3.6.0...v4.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/cache.yml

@@ -22,7 +22,7 @@ jobs:
           sudo apt-get install git-svn --no-install-recommends
 
       - name: checkout authors
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
         with:
           ref: travis
           path: ./authors
@@ -49,7 +49,7 @@ jobs:
       #    rm ./src/fhem-mirror/.git/config 
 
       - name: checkout main branch
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
         with:
           path: ./src/fhem-mirror
           clean: false

.github/workflows/mirror.yml

@@ -25,7 +25,7 @@ jobs:
           sudo apt-get install git-svn --no-install-recommends
 
       - name: checkout mirror config branch
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
 
       - name: Get current date as seconds
         id: get-date