Update dependency com.google.testing.compile:compile-testing to v0.21.0

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.testing.compile:compile-testing	`0.19` -> `0.21.0`

Release Notes

google/compile-testing (com.google.testing.compile:compile-testing)

### [`v0.21.0`](https://togithub.com/google/compile-testing/releases/tag/v0.21.0): 0.21.0 - Fixed a bug: When comparing ASTs, for example in `JavaFileObjectSubject.hasSourceEquivalentTo`, some kinds of nodes were omitted from the comparison. In particular, if the expected code had an annotated type or a union type (multicatch), the actual code could contain anything at that point and the test would still pass. This was also true for post-Java-8 constructs like module declarations, `yield` statements, and the like. These omissions have been corrected. **Some tests may now fail** if the expected and actual source do not match, in ways that were hidden by this bug. (https://github.com/google/compile-testing/commit/9a592f77821adecf10a16a7a4cdd2f071ddcf136)

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micronaut-projects / micronaut-sourcegen

Update dependency com.google.testing.compile:compile-testing to v0.21.0 #49

Release Notes

Configuration

Quality Gate passed