Upgrade actions/checkout to v4.0.0

[nilsreichardt]

Sometimes we had the following issue in our CI

Prepare all required actions
Getting action download info
Download action repository 'actions/checkout@f43a0e5ff2bd294095638e[18](https://github.com/SharezoneApp/sharezone-app/actions/runs/6081692757/job/16497871915?pr=883#step:1:22)286ca9a3d[19](https://github.com/SharezoneApp/sharezone-app/actions/runs/6081692757/job/16497871915?pr=883#step:1:23)56744' (SHA:f43a0e5ff2bd294095638e18286ca9a3d1956744)
Error: Can't use 'tar -xzf' extract archive file: /home/runner/work/_actions/_temp_cbdafda6-2c5b-4638-b6be-e6d65c6e3a8a/4afea807-b012-4842-986f-87c77b76bc37.tar.gz. return code: 2.

This is the issue: actions/checkout#1448. Upgrading to 4.0.0 should fix the issue (see actions/checkout#1448 (comment))

[github-actions]

Visit the preview URL for this PR (updated for commit b45c03f):

https://sharezone-test--pr887-upgrade-checkout-vro1ibun.web.app

_{(expires Fri, 08 Sep 2023 08:43:23 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: 4cb3ae61e1e018abfd9841fd3239f5b49ccc034b}