RFR: 8299193: Declare Buffer.capacity final

[Jaikiran Pai]

On Wed, 21 Dec 2022 12:22:33 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> It is possible to declare the field `capacity` in `java.nio.Buffer` `final` as the value never changes outside the constructors.

Hello Per, this and the other similar PR will need their PR title to be updated to match their latest JBS issue summaries.

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PR: https://git.openjdk.org/jdk/pull/11755