Update dependency com.uber.nullaway:nullaway to v0.13.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.uber.nullaway:nullaway	0.13.0 → 0.13.1

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Release Notes

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

v0.13.1

• Improve verification of !null -> !null contracts (#​1441)
• Substitute inferred @NonNull types for generic method inference (#​1445)
• Better support for some contracts with boolean argument constraints (#​1447)
• Maintenance
  • Add junit-framework as another integration test (#​1446)

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