fix(deps): Update dependency org.mockito:mockito-core to v5.21.0 (#405)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [org.mockito:mockito-core](https://redirect.github.com/mockito/mockito) | dependencies | minor | `5.20.0` -> `5.21.0` |

---

### Release Notes

<details>
<summary>mockito/mockito (org.mockito:mockito-core)</summary>

### [`v5.21.0`](https://redirect.github.com/mockito/mockito/releases/tag/v5.21.0)

<sup><sup>*Changelog generated by [Shipkit Changelog Gradle Plugin](https://redirect.github.com/shipkit/shipkit-changelog)*</sup></sup>

##### 5.21.0

-   2025-12-09 - [17 commit(s)](https://redirect.github.com/mockito/mockito/compare/v5.20.0...v5.21.0) by Giulio Longfils, Joshua Selbo, Woongi9, Zylox, dependabot\[bot]
-   Bump graalvm/setup-graalvm from 1.4.3 to 1.4.4 [(#&#8203;3768)](https://redirect.github.com/mockito/mockito/pull/3768)
-   Bump graalvm/setup-graalvm from 1.4.2 to 1.4.3 [(#&#8203;3767)](https://redirect.github.com/mockito/mockito/pull/3767)
-   Bump actions/checkout from 5 to 6 [(#&#8203;3765)](https://redirect.github.com/mockito/mockito/pull/3765)
-   Adds output of matchers to potential mismatch; Fixes [#&#8203;2468](https://redirect.github.com/mockito/mockito/issues/2468) [(#&#8203;3760)](https://redirect.github.com/mockito/mockito/pull/3760)
-   Forbid mocking WeakReference with inline mock maker [(#&#8203;3759)](https://redirect.github.com/mockito/mockito/pull/3759)
-   StackOverflowError when mocking WeakReference [(#&#8203;3758)](https://redirect.github.com/mockito/mockito/issues/3758)
-   Bump actions/upload-artifact from 4 to 5 [(#&#8203;3756)](https://redirect.github.com/mockito/mockito/pull/3756)
-   Bump graalvm/setup-graalvm from 1.4.1 to 1.4.2 [(#&#8203;3755)](https://redirect.github.com/mockito/mockito/pull/3755)
-   Support primitives in GenericArrayReturnType. [(#&#8203;3753)](https://redirect.github.com/mockito/mockito/pull/3753)
-   ClassNotFoundException when stubbing array of primitive type on Android [(#&#8203;3752)](https://redirect.github.com/mockito/mockito/issues/3752)
-   Bump graalvm/setup-graalvm from 1.4.0 to 1.4.1 [(#&#8203;3744)](https://redirect.github.com/mockito/mockito/pull/3744)
-   Bump gradle/actions from 4 to 5 [(#&#8203;3743)](https://redirect.github.com/mockito/mockito/pull/3743)
-   Bump org.graalvm.buildtools.native from 0.11.0 to 0.11.1 [(#&#8203;3738)](https://redirect.github.com/mockito/mockito/pull/3738)
-   Bump com.diffplug.spotless:spotless-plugin-gradle from 7.2.1 to 8.0.0 [(#&#8203;3735)](https://redirect.github.com/mockito/mockito/pull/3735)
-   Bump graalvm/setup-graalvm from 1.3.7 to 1.4.0 [(#&#8203;3734)](https://redirect.github.com/mockito/mockito/pull/3734)
-   Bump org.assertj:assertj-core from 3.27.5 to 3.27.6 [(#&#8203;3733)](https://redirect.github.com/mockito/mockito/pull/3733)
-   Bump errorprone from 2.41.0 to 2.42.0 [(#&#8203;3732)](https://redirect.github.com/mockito/mockito/pull/3732)
-   Feat: automatically detect class to mock in mockStatic and mockConstruction [(#&#8203;3731)](https://redirect.github.com/mockito/mockito/pull/3731)
-   Return completed futures for unstubbed Future/CompletionStage in ReturnsEmptyValues [(#&#8203;3727)](https://redirect.github.com/mockito/mockito/pull/3727)
-   automatically detect class to mock [(#&#8203;2779)](https://redirect.github.com/mockito/mockito/pull/2779)
-   Incorrect "has following stubbing(s) with different arguments" message when using Argument Matchers [(#&#8203;2468)](https://redirect.github.com/mockito/mockito/issues/2468)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - Between 12:00 AM and 03:59 AM, on day 1 of the month ( * 0-3 1 * * ) (UTC), Automerge - At any time (no schedule defined).

🚦 **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.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://redirect.github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MC4yMi4xIiwidXBkYXRlZEluVmVyIjoiNDAuMjIuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiYXV0b21lcmdlIl19-->

Author: cq-bot

lib/build.gradle

@@ -49,7 +49,7 @@ dependencies {
     testImplementation platform('org.junit:junit-bom:6.0.0')
     testImplementation 'org.junit.jupiter:junit-jupiter:6.0.0'
     testImplementation 'org.junit.jupiter:junit-jupiter-api:6.0.0'
-    testImplementation 'org.mockito:mockito-core:5.20.0'
+    testImplementation 'org.mockito:mockito-core:5.21.0'
     testImplementation 'org.mockito:mockito-junit-jupiter:5.20.0'
     testImplementation 'nl.jqno.equalsverifier:equalsverifier:4.3.1'
     testImplementation 'org.assertj:assertj-core:3.27.7'