Update dependency com.uber.nullaway:nullaway to v0.12.15

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.uber.nullaway:nullaway	0.12.14 -> 0.12.15

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Release Notes

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

v0.12.15

NullAway now includes a BOM artifact com.uber.nullaway:nullaway-bom. Otherwise, this release contains a few bug
fixes and improvements to JSpecify support.

• Fix URL for RequireExplicitNullMarking checker (#​1369)
• Handle annotations on type variables in return and field types (#​1371)
• Change how recursive calls to dataflow are detected (#​1374)
• JSpecify: use type on identifier when its type is a type variable (#​1378)
• Include method type parameters in astubx files. by @​haewiful (#​1370)
• Create nullaway-bom project (#​1130) by @​lpireyn (#​1380)
• Run dataflow analysis on bodies of lambdas passed to generic methods (#​1375)
• Maintenance
  • Remove BaseNoOpHandler and replace with default methods in Handler (#​1376)

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