chore(deps): update dependency com.uber.nullaway:nullaway to v0.13.8

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This PR contains the following updates:

Package	Change	Age	Confidence
com.uber.nullaway:nullaway	0.13.7 → 0.13.8

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Release Notes

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

v0.13.8

Mostly minor bug fixes. Note that NullAway now treats Map.remove as returning @Nullable (#​1623), which may lead
to newly-reported warnings.

• Quote syntax element references in error messages by @​AryamannSingh7 (#​1620)
• Fix stream nullability propagation through sorted() (Fixes #​1538) by @​dyrpsf (#​1610)
• Add support for reactor by @​subhramit (#​1599)
• Fix issue with passing poly expression to a function parameter with type from library model (#​1614)
• Fix crash with library model @​Nullable being applied to wildcard (#​1615)
• Add more modeling for Optional (#​1613)
• Update lombok section at README.md by @​jevanlingen (#​1624)
• Model Map.remove as nullable by @​codingkiddo (#​1623)
• Better support for conditional expressions in JSpecify mode (#​1608)
• Fix issue with reading annotations on record constructor parameters due to javac bug (#​1636)
• Maintenance
  • Update to Gradle 9.6.1 and AGP 9.3.0 (#​1634)

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⚠️ API changes detected — maintainer review required

This PR modifies the published API diff for the following module(s):

• prometheus-metrics-instrumentation-caffeine
• prometheus-metrics-instrumentation-guava

Please review the changes in docs/apidiffs/current_vs_latest/ carefully before approving.

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