fix(deps): Update dependency nl.jqno.equalsverifier:equalsverifier to v3.18.1 (#317)

This PR contains the following updates:

| Package | Type | Update | Change | Pending |
|---|---|---|---|---|
| [nl.jqno.equalsverifier:equalsverifier](https://www.jqno.nl/equalsverifier) ([source](https://togithub.com/jqno/equalsverifier)) | dependencies | minor | `3.17.4` -> `3.18.1` | `3.18.2` |

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### Release Notes

<details>
<summary>jqno/equalsverifier (nl.jqno.equalsverifier:equalsverifier)</summary>

### [`v3.18.1`](https://togithub.com/jqno/equalsverifier/blob/HEAD/CHANGELOG.md#3181---2025-01-09)

##### Added

-   Improved Kotlin support. ([Issue 506](https://togithub.com/jqno/equalsverifier/issues/506#issuecomment-2563664670))

### [`v3.18`](https://togithub.com/jqno/equalsverifier/blob/HEAD/CHANGELOG.md#3182---2025-01-30)

##### Fixed

-   Gives readable error message when trying to use `forPackage()` on third-party dependency package, instead of a `NullPointerException`. ([Issue 1040](https://togithub.com/jqno/equalsverifier/issues/1040))

### [`v3.17.5`](https://togithub.com/jqno/equalsverifier/blob/HEAD/CHANGELOG.md#3175---2024-12-06)

##### Fixed

-   SpotBugs-annotations dependency is suddenly needed in builds that do certain kinds of annotation processing. ([Issue 1026](https://togithub.com/jqno/equalsverifier/issues/1026))
-   Significant fields error when testing a class with a field that has a Map with an array as its value type. ([Issue 1027](https://togithub.com/jqno/equalsverifier/issues/1027))

##### Changed

-   Reverted the refactorings introduced in versions 3.17.2, 3.17.3 and 3.17.4, as they were causing more problems than they were solving. See [this blog post](https://jqno.nl/post/2024/12/06/unrefactoring/) for some background.

</details>

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Author: cq-bot

Diff for: lib/build.gradle

@@ -55,7 +55,7 @@ dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.11.4'
     testImplementation 'org.mockito:mockito-core:5.14.2'
     testImplementation 'org.mockito:mockito-junit-jupiter:5.14.2'
-    testImplementation 'nl.jqno.equalsverifier:equalsverifier:3.17.4'
+    testImplementation 'nl.jqno.equalsverifier:equalsverifier:3.18.1'
     testImplementation 'org.assertj:assertj-core:3.26.3'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.11.4'