chore(deps): update ghcr.io/nextcloud/continuous-integration-android8 docker tag to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/nextcloud/continuous-integration-android8	docker	major	3 -> 4

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[github-actions]

Codacy

Lint

Type	master	PR
Warnings	51	51
Errors	11	11

SpotBugs

Category	Base	New
Bad practice	65	65
Correctness	58	62
Dodgy code	292	279
Experimental	1	1
Internationalization	7	7
Malicious code vulnerability	1	2
Multithreaded correctness	7	35
Performance	51	48
Security	18	18
Total	500	517

SpotBugs increased!

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/14376.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.