RFR: 8302979: (fs) Files usage of SUPPORTED_CHARSETS could be simplified [v2]

[Julian Waters]

On Wed, 22 Feb 2023 07:38:05 GMT, Sergey Tsypanov <stsypanov at openjdk.org> wrote:

>> Code of `Files.lines()` could be slightly simplified:
>> 
>> - use charsets instead of their names
>> - use `Set.of()` instead of `HashSet` in `FileChannelLinesSpliterator`
>
> Sergey Tsypanov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix indentation

Alright, thanks for the fixes :)

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PR: https://git.openjdk.org/jdk/pull/12688