Bump value from 2.8.8 to 2.9.0 (#785)

Bumps [value](https://github.com/immutables/immutables) from 2.8.8 to 2.9.0.
- [Release notes](https://github.com/immutables/immutables/releases)
- [Commits](https://github.com/immutables/immutables/commits)

---
updated-dependencies:
- dependency-name: org.immutables:value
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

typescript-generator-core/pom.xml

@@ -99,7 +99,7 @@
         <dependency>
             <groupId>org.immutables</groupId>
             <artifactId>value</artifactId>
-            <version>2.8.8</version>
+            <version>2.9.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>