en/news: document new and returning src committers in 2026HEADmain

The dates picked for the news entries is based on the date that the
entry was added in the access file under the `internal/admin` branch.

This only includes new/returning src commit bits; some docs and ports
commit bits may have been missed in this change.

Reviewed by:	carlavilla
Approved by:	carlavilla
Differential Revision:	https://reviews.freebsd.org/D61075

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