Loosen bounds on latest base

[vmchale]

I have confirmed that cassava 0.5.2.0 builds with GHC-9.0, i.e. base 4.15.x

Cheers.

[maoe]

This is currently blocking criterion to be built with GHC 9.0.1:

'cabal.project.local' already exists, backing it up to 'cabal.project.local~'.
Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: criterion-1.5.9.0 (user goal)
[__1] trying: vector-0.12.2.0 (dependency of criterion)
[__2] trying: primitive-0.7.1.0 (dependency of vector)
[__3] trying: cassava-0.5.2.0 (dependency of criterion)
[__4] next goal: base (dependency of criterion)
[__4] rejecting: base-4.15.0.0/installed-4.15.0.0 (conflict: cassava =>
base>=4.5 && <4.15)
[__4] 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)
[__4] fail (backjumping, conflict set: base, cassava, criterion)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, vector, criterion, primitive,
cassava

[phadej]

I made revision for cassava-0.5.2.0 allowing base-4.15: https://hackage.haskell.org/package/cassava-0.5.2.0/revisions/