NullAway 0.11.0

IMPORTANT: Support for JDK 8 is dropped and NullAway now requires ErrorProne 2.14.0 or higher.

• Delete OptionalEmptinessHandler method that is no longer needed (#954)
• Refactor PreservedAnnotationTreeVisitor (#955)
• Update to Error Prone 2.27.1 (#957)
• JSpecify subtyping checks for arrays (#956)
• Bump to Checker Framework 3.43.0 (#959)
• Drop Java 8 support (#961)