RFR: 8301492: Modernize equals() method of ResourceBundle.CacheKey and Bundles.CacheKey [v5]

[Naoto Sato]

On Mon, 26 Jun 2023 09:46:08 GMT, Sergey Tsypanov <stsypanov at openjdk.org> wrote:

>> `ResourceBundle.CacheKey.equals()` and `Bundles.CacheKey.equals()` are quire outdated. This simple clean-up modernizes them.
>
> Sergey Tsypanov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8301492: Revert

Marked as reviewed by naoto (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/12328#pullrequestreview-1498996353