chore(deps): update dependency io.micronaut:micronaut-validation to v1.2.9

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
io.micronaut:micronaut-validation (source)	patch	1.2.8 -> 1.2.9

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Release Notes

micronaut-projects/micronaut-core

v1.2.9

Compare Source

• Release Notes:
  https://docs.micronaut.io/1.2.9/guide/index.html#whatsNew
• Issues Closed: https://github.com/micronaut-projects/micronaut-core/milestone/33?closed=1

NOTICE: It can take a while for all the dependencies to arrive to Maven Central and JCenter, if you are having dependency resolution issues add the following repository:

repositories {
    maven {
        url  "https://dl.bintray.com/micronaut/core-releases-local" 
    }
}

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