Update moshix to v0.21.0

[slack-oss-bot]

This PR contains the following updates:

Package	Type	Update	Change
dev.zacsweers.moshix	plugin	minor	0.20.0 -> 0.21.0
dev.zacsweers.moshix:moshi-gradle-plugin	dependencies	minor	0.20.0 -> 0.21.0

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Release Notes

ZacSweers/MoshiX

v0.21.0

Compare Source

2022-12-28

New: Update to Kotlin 1.8.0.

• For moshi-ir, this release is only compatible with Kotlin 1.8 or later.
• Migrate the IR and FIR plugins to new CompilerPluginRegistrar entrypoint API.

New: Experimental support for the new K2 compiler in moshi-ir.

Note this comes with several caveats:

• There is no FIR plugin in moshi-ir itself (not needed). This just marks itself as compatible with the new compiler and avoids using incompatible IR APIs.
• This only works if proguard rule generation is disabled, as there is no support in FIR currently for generating files.
• K2 compiler itself is extremely experimental.

In short, this is only really to unblock anyone doing their own testing of K2 and don't want this
plugin to disable it. If you see any issues, please file a bug here and disable K2 in your project
in the meantime.

Misc

• Update JVM target to 11.
• Update Anvil compiler-utils to 2.4.3.

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