Update dependency org.jetbrains:annotations to v26 (mulk/jgvariant!31)

This MR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [org.jetbrains:annotations](https://github.com/JetBrains/java-annotations) | compile | major | `25.0.0` -> `26.0.1` |

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### Release Notes

<details>
<summary>JetBrains/java-annotations</summary>

### [`v26.0.1`](https://github.com/JetBrains/java-annotations/blob/HEAD/CHANGELOG.md#Version-2601)

[Compare Source](https://github.com/JetBrains/java-annotations/compare/26.0.0...26.0.1)

-   Fixed sources.jar build (regression after 25.0.0)

### [`v26.0.0`](https://github.com/JetBrains/java-annotations/blob/HEAD/CHANGELOG.md#Version-2600)

[Compare Source](https://github.com/JetBrains/java-annotations/compare/25.0.0...26.0.0)

-   Added new experimental annotation: `@NotNullByDefault`

</details>

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