fix: Also substitute `COPYRIGHT HOLDER` and `the organization` in BSD 4-Clause license (#6942)
Fixes #6864
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6942
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Beowulf <beowulf@beocode.eu>
Co-committed-by: Beowulf <beowulf@beocode.eu>