Update androidPluginVersion to v9.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.android.library (source)	9.3.2 → 9.4.0
com.android.application (source)	9.3.2 → 9.4.0

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: gradle/libs.versions.toml

Command failed: ./gradlew -Dorg.gradle.jvmargs=-Xms512m -Xmx512m --console=plain --dependency-verification lenient -q --write-verification-metadata sha256,pgp dependencies

FAILURE: Build completed with 2 failures.

1: Task failed with an exception.
-----------
* Where:
Build file '/tmp/renovate/repos/github/nextcloud/android/build.gradle.kts' line: 7

* What went wrong:
Plugin [id: 'com.google.devtools.ksp', version: '2.3.11', apply: false] was not found in any of the following sources:

- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Included Builds (No included builds contain this plugin)
- Plugin Repositories (could not resolve plugin artifact 'com.google.devtools.ksp:com.google.devtools.ksp.gradle.plugin:2.3.11')
  Searched in the following repositories:
    Google
    Gradle Central Plugin Repository
    MavenRepo

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights from a Build Scan (powered by Develocity).
> Get more help at https://help.gradle.org.
==============================================================================

2: Task failed with an exception.
-----------
* Where:
Build file '/tmp/renovate/repos/github/nextcloud/android/build.gradle.kts' line: 7

* What went wrong:
Plugin [id: 'com.google.devtools.ksp', version: '2.3.11', apply: false] was not found in any of the following sources:

- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Included Builds (No included builds contain this plugin)
- Plugin Repositories (could not resolve plugin artifact 'com.google.devtools.ksp:com.google.devtools.ksp.gradle.plugin:2.3.11')
  Searched in the following repositories:
    Google
    Gradle Central Plugin Repository
    MavenRepo

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights from a Build Scan (powered by Develocity).
> Get more help at https://help.gradle.org.
==============================================================================

BUILD FAILED in 55s

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/33977710225/artifacts/9972903588
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]

blue-Light-Screenshot test failed, but no output was generated. Maybe a preliminary stage failed.

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/34122515308/artifacts/10019619306
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

SpotBugs

Category	Base	New
Bad practice	35	35
Correctness	58	58
Dodgy code	195	195
Experimental	1	1
Malicious code vulnerability	2	2
Multithreaded correctness	26	26
Performance	37	37
Security	19	19
Total	373	373

[github-actions]

master-IT test failed: https://www.kaminsky.me/nc-dev/android-integrationTests/17560-IT-master-13-15