cabal-bundler doesn't support GHC 9

[kozross]

As per this CI breakage. More specifically:

[__0] trying: cabal-bundler-0.1 (user goal)
[__1] next goal: base (dependency of cabal-bundler)
[__1] rejecting: base-4.15.0.0/installed-4.15.0.0 (conflict: cabal-bundler =>
base^>=4.12.0.0 || ^>=4.13.0.0 || ^>=4.14.0.0)
[__1] rejecting: base-4.14.1.0, base-4.14.0.0, base-4.13.0.0, base-4.12.0.0,
base-4.11.1.0, base-4.11.0.0, base-4.10.1.0, base-4.10.0.0, base-4.9.1.0,
base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0, base-4.7.0.2,
base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0, base-4.5.1.0,
base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0, base-4.3.0.0,
base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0, base-4.0.0.0,
base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable package requires
installed instance)
[__1] fail (backjumping, conflict set: base, cabal-bundler)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, cabal-bundler

[phadej]

This repository is not buildable with GHC-9.0 nor GHC-9.2, but if you build it with older GHCs, you can use it with newer ones. So far both 9.0 and 9.2 are broken, so I'm not in hurry supporting them. This will apply to future GHCs as well.