Clearly specify license as AGPL-3-or-later in cabal file

vervis.cabal

@@ -1,3 +1,4 @@
+cabal-version:       2.2
 name:                vervis
 version:             0.1
 synopsis:            Federated project hosting platform
@@ -10,7 +11,7 @@ description:
   released under the AGPL 3 license.
 homepage:            https://vervis.peers.community/repos/rjQ3E
 bug-reports:         pere@towards.vision
-license:             AGPL-3
+license:             AGPL-3.0-or-later
 license-file:        COPYING.AGPL3
 author:              Pere Lev
 maintainer:          pere@towards.vision
@@ -23,7 +24,6 @@ extra-source-files:  AUTHORS.md
                      FEDERATION.md
                      INSTALL.md
                      README.md
-cabal-version:       >=1.10
 
 source-repository head
   type:                git