README is lacking mention of LICENSE and Copyright
The README should mention the LICENSE and (ideally, if given) the Copyright holders, to directly show awareness.
Additionally and technically not part of this issue, I and many others prefer to employ the "or any later" variants of GNU licenses (e.g. AGPLv3+, SPDX: AGPL-3.0-or-later).
If you want, I create a merge request to mention agplv3 in the README. As I have not yet looked into your governance, the "v3+" addition and probably the Copyright mention (if at all) should come from somebody more affiliated.