Update spotbugsGradlePlugin to v6.5.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.github.spotbugs	6.5.4 → 6.5.8

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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
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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.
-----------
* What went wrong:
A problem occurred configuring project ':app'.
> com.android.builder.sdk.LicenceNotAcceptedException: Failed to install the following Android SDK packages as some licences have not been accepted.
     ndk;29.0.14206865 NDK (Side by side) 29.0.14206865
  To build this project, accept the SDK license agreements and install the missing components using the Android Studio SDK Manager.
  All licenses can be accepted using the sdkmanager command line tool:
  sdkmanager.bat --licenses
  Or, to transfer the license agreements from one workstation to another, see https://developer.android.com/studio/intro/update.html#download-with-gradle
  
  Using Android SDK: /home/ubuntu/.android-sdk

* 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.
-----------
* What went wrong:
A problem occurred configuring project ':app'.
> com.android.builder.sdk.LicenceNotAcceptedException: Failed to install the following Android SDK packages as some licences have not been accepted.
     ndk;29.0.14206865 NDK (Side by side) 29.0.14206865
  To build this project, accept the SDK license agreements and install the missing components using the Android Studio SDK Manager.
  All licenses can be accepted using the sdkmanager command line tool:
  sdkmanager.bat --licenses
  Or, to transfer the license agreements from one workstation to another, see https://developer.android.com/studio/intro/update.html#download-with-gradle
  
  Using Android SDK: /home/ubuntu/.android-sdk

* 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 3m 46s

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/27813409971/artifacts/7744788263
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]

test-Unit test failed, but no output was generated. Maybe a preliminary stage failed.

[github-actions]

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