Update errorProneVersion to v2.27.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.errorprone:error_prone_core (source)	2.26.1 -> 2.27.0
com.google.errorprone:error_prone_annotations (source)	2.26.1 -> 2.27.0

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Release Notes

google/error-prone (com.google.errorprone:error_prone_core)

v2.27.0: Error Prone 2.27.0

New checks:

• ClassInitializationDeadlock detects class initializers that reference subtypes of the current class, which can result in deadlocks.
• MockitoDoSetup suggests using when/thenReturn over doReturn/when for additional type safety.
• VoidUsed suggests using a literal null instead of referring to a Void-typed variable.

Modified checks:

• TruthSelfEquals has been renamed and generalized as SelfAssertion
• RedundantSetterCall has been improved, and enabled as an error oby default

Closed issues: #​4291. #​4308, #​4343, #​4320

Full Changelog: google/error-prone@v2.26.1...v2.27.0

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[jkwatson]

looks like this one will require a small tweak to a couple of places to get working