Update dependency com.uber.nullaway:nullaway to v0.10.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.uber.nullaway:nullaway	0.10.19 -> 0.10.21

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Release Notes

uber/NullAway (com.uber.nullaway:nullaway)

v0.10.21

IMPORTANT: This release fixes a crash when running against <2.24.0 release of
Error Prone (see #​894) introduced in NullAway v0.10.20 and another crash related to
Checker Framework (see #​895) introduced in NullAway v0.10.19.

• Fix backwards-incompatible calls to ASTHelpers.hasDirectAnnotationWithSimpleName (#​894)
• Downgrade to Checker Framework 3.40.0 (#​895)

v0.10.20

• Fix JSpecify support on JDK 21 (#​869)
• Build / CI tooling upgrades for NullAway itself:
  • Update to WALA 1.6.3 (#​887)
  • Update to Error Prone 2.24.1 (#​888)

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