[clang-tools-extra] [clang-tidy] Change AllowCastToVoid default to true in bugprone-unused-return-value (PR #200173)

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gamesh411 wrote:

Updated the PR, moved the release notes to the Possibly Breaking Changes section.
What do you think about the current state of this @zwuis ?

https://github.com/llvm/llvm-project/pull/200173