Bump value from 2.8.8 to 2.8.9-ea-1

Bumps [value](https://github.com/immutables/immutables) from 2.8.8 to 2.8.9-ea-1.
- [Release notes](https://github.com/immutables/immutables/releases)
- [Changelog](https://github.com/immutables/immutables/blob/master/CHANGELOG.md)
- [Commits](https://github.com/immutables/immutables/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

pom.xml

@@ -19,7 +19,7 @@
 
     <!-- Dependency versions -->
     <assertj.version>3.18.1</assertj.version>
-    <immutables.version>2.8.8</immutables.version>
+    <immutables.version>2.8.9-ea-1</immutables.version>
     <jackson.version>2.12.0</jackson.version>
     <jmh.version>1.26</jmh.version>
     <junit4.version>4.13.1</junit4.version>