Bump managed kotlin version to 1.7.10

[wetted]

satisfies https://github.com/micronaut-projects/micronaut-kotlin/issues/414

[timyates]

We see lots of 1.6.21 in the dependency list

https://ge.micronaut.io/s/bjjijqfihhmsu/dependencies?dependencies=1.6.21&expandAll

But I believe these are due to the POM for org.jetbrains.kotlinx:kotlinx-coroutines-jdk8:1.6.4 having a dependency on it

I think none of these are being pulled by Gradle, but when they are it's picking the correct one

https://ge.micronaut.io/s/bjjijqfihhmsu/dependencies?dependencies=1.6.21&expandAll&focusedDependency=WzQxLDEsNDI0OCxbNiwwLFsyNl1dXQ

@melix is my understanding correct?

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[sdelamo]

ping @melix