HBASE-29935 Update copyright notices year to 2026

[liuxiaocs7]

• see: HBASE-29935

[PDavid]

Thanks! 👍

[NihalJain]

Please ensure ship to all branches

[vaijosh]

LGTM

[liuxiaocs7]

Please ensure ship to all branches

Hi, @NihalJain, thanks for your comments, I think this patch can be backported other branches clean directly, is there anything else I need to do, thanks!

[PDavid]

Please ensure ship to all branches

Hi, @NihalJain, thanks for your comments, I think this patch can be backported other branches clean directly, is there anything else I need to do, thanks!

As soon as the build is fixed on master 🤞 (#7842) I'll merge this in and push it to rest of the active branches. I think it should apply cleanly.

[Apache9]

Will this cause spotless:apply to update all the files in our repo?