chore(deps): update ubuntu:noble docker digest to c4a8d55

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ubuntu	final	digest	84e77de → c4a8d55

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[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/24489858048/artifacts/6465369604
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	88	87
Errors	0	0

SpotBugs

Category	Base	New
Bad practice	6	6
Correctness	10	10
Dodgy code	53	53
Internationalization	3	3
Malicious code vulnerability	3	3
Performance	4	4
Security	1	1
Total	80	80