The announcement of gnupg-2.4.0 described it as "a new stable GnuPG release." When I verify a signed tarball I see a message that it is a development version, which, to me at least, seems to contradict the announcement. For example:
$ xzcat linux-6.0.15.tar.xz | gpg --verify linux-6.0.15.tar.sign -
gpg: NOTE: THIS IS A DEVELOPMENT VERSION!
gpg: It is only intended for test purposes and should NOT be
gpg: used in a production environment or with production keys!
gpg: Signature made Wed 21 Dec 2022 16:42:18 GMT
gpg: using RSA key 647F28654894E3BD457199BE38DBBDC86092693E
gpg: Good signature from "Greg Kroah-Hartman <email@example.com>" [unknown]
gpg: aka "Greg Kroah-Hartman (Linux kernel stable release signing key) <firstname.lastname@example.org>" [unknown]
gpg: aka "Greg Kroah-Hartman <email@example.com>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: 647F 2865 4894 E3BD 4571 99BE 38DB BDC8 6092 693E