RFR: 8314129: Make fields final in java.util.Scanner

[Sergey Tsypanov]

On Thu, 13 Jul 2023 08:57:05 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> Made a few fields `final` in java.util.Scanner.
> Also made `digits`, `non0Digit`, `SIMPLE_GROUP_INDEX` as `static.`

Marked as reviewed by stsypanov (Author).

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PR Review: https://git.openjdk.org/jdk/pull/14863#pullrequestreview-1528793589