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MINOR: [Java] Bump Netty to 4.1.108.Final (#40491)

### Rationale for this change

[Java] bump to latest version of Netty

https://netty.io/news/2024/02/13/4-1-107-Final.html

https://netty.io/news/2024/03/21/4-1-108-Final.html

### What changes are included in this PR?

modified Java pom.xml

### Are these changes tested?

GitHub Actions CI build

### Are there any user-facing changes?

No

Authored-by: sullis <github@seansullivan.com>
Signed-off-by: David Li <li.davidm96@gmail.com>