fix(deps): update dependency com.android.tools.build:gradle to v8.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.android.tools.build:gradle (source)	8.5.2 -> 8.6.0

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Configuration

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🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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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: library/build.gradle

Command failed: ./gradlew --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-library/sample_client/build.gradle' line: 22

* What went wrong:
A problem occurred evaluating project ':sample_client'.
> Failed to apply plugin 'com.android.internal.version-check'.
   > Using different versions of the Android Gradle plugin (8.6.0, 8.5.2) in the same build is not allowed.

* 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.
> Get more help at https://help.gradle.org.
==============================================================================

2: Task failed with an exception.
-----------
* Where:
Build file '/tmp/renovate/repos/github/nextcloud/android-library/sample_client/build.gradle' line: 22

* What went wrong:
A problem occurred evaluating project ':sample_client'.
> Failed to apply plugin 'com.android.internal.version-check'.
   > Using different versions of the Android Gradle plugin (8.6.0, 8.5.2) in the same build is not allowed.

* 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.
> Get more help at https://help.gradle.org.
==============================================================================

BUILD FAILED in 3m 15s

[github-actions]

SpotBugs

Category	Base	New
Bad practice	35	35
Correctness	34	34
Dodgy code	26	26
Internationalization	6	6
Malicious code vulnerability	49	49
Multithreaded correctness	3	3
Performance	8	8
Total	161	161

[github-actions]

SpotBugs

Category	Base	New
Bad practice	35	35
Correctness	34	34
Dodgy code	26	26
Internationalization	6	6
Malicious code vulnerability	49	49
Multithreaded correctness	3	3
Performance	8	8
Total	161	161

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.93%. Comparing base (e3d8609) to head (a22b36a).
Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1530      +/-   ##
============================================
+ Coverage     48.90%   48.93%   +0.02%     
- Complexity     1002     1003       +1     
============================================
  Files           209      209              
  Lines          7866     7866              
  Branches       1021     1021              
============================================
+ Hits           3847     3849       +2     
+ Misses         3461     3460       -1     
+ Partials        558      557       -1     

see 1 file with indirect coverage changes