[Hacktoberfest] LogMatchCallback fields may be 'final'

[manusa]

Description

The following statement is reported as a code style issue:

https://github.com/eclipse/jkube/blob/c15c4bb8b7cc4ea7502f8314b1e067b27f9a1dda/jkube-kit/build/service/docker/src/main/java/org/eclipse/jkube/kit/build/service/docker/wait/LogMatchCallback.java#L27

• [ ] should be changed to:

    private final StringBuilder logBuffer;

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