fix(deps): update dependency io.micronaut.rxjava2:micronaut-rxjava2-bom to v2.0.0-m4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.micronaut.rxjava2:micronaut-rxjava2-bom (source)	2.0.0-M3 -> 2.0.0-M4

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Release Notes

micronaut-projects/micronaut-rxjava2

### [`v2.0.0-M4`](https://togithub.com/micronaut-projects/micronaut-rxjava2/releases/tag/v2.0.0-M4): Micronaut RxJava2 2.0.0-M4 #### What's Changed ##### Dependency updates 🚀 - fix(deps): update dependency io.micronaut.validation:micronaut-validation-bom to v4.0.0-m9 by [@​renovate](https://togithub.com/renovate) in [https://github.com/micronaut-projects/micronaut-rxjava2/pull/153](https://togithub.com/micronaut-projects/micronaut-rxjava2/pull/153) ##### Other Changes 💡 - RxJava2 to M6 by [@​sdelamo](https://togithub.com/sdelamo) in [https://github.com/micronaut-projects/micronaut-rxjava2/pull/154](https://togithub.com/micronaut-projects/micronaut-rxjava2/pull/154) **Full Changelog**: https://github.com/micronaut-projects/micronaut-rxjava2/compare/v2.0.0-M3...v2.0.0-M4

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