fix(deps): update errorproneversion to v2.42.0 (minor)

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This PR contains the following updates:

Package	Change	Age	Confidence
com.google.errorprone:error_prone_test_helpers (source)	2.41.0 -> 2.42.0
com.google.errorprone:error_prone_core (source)	2.41.0 -> 2.42.0
com.google.errorprone:error_prone_annotations (source)	2.41.0 -> 2.42.0

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Release Notes

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

v2.42.0: Error Prone 2.42.0

New checks:

• ExplicitArrayForVarargs: discourage unnecessary explicit construction of an array to provide varargs.
• FloggerPerWithoutRateLimit: discourage Flogger's perUnique without rate limiting
• StringJoin: Ban String.join(CharSequence) and String.join(CharSequence, CharSequence)
• ThreadBuilderNameWithPlaceholder: Do not allow placeholders in Thread.Builder.name(String) or name(String, int).

Changes:

• The return type of ASTHelpers.asFlagSet has changed. The previous type was EnumSet<Flags.Flag>, where Flags.Flag is an enum in the javac class Flags. A recent JDK change has replaced that enum with a new top-level enum called FlagsEnum. It is not possible to change ASTHelpers.asFlagSet in a way that would be type-safe and compatible with the enums from JDKs both before and after the change. Instead, the method now returns ImmutableSet<String>, where the strings come from the toString() of the enum constants. That means they are "native", "abstract", etc.
• Flag IO.print[ln]() in SystemOut.

Full changelog: google/error-prone@v2.41.0...v2.42.0

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