Bump lower bound on io-classes for stric-mvar.

The module containing the `MonadMVar` class changes between
`io-classes-1.0` and `io-classes-1.1`, so we must set `io-classes.1.1`
as a lower bound.

Author: jorisdral

strict-mvar/strict-mvar.cabal

@@ -28,7 +28,7 @@ library
   exposed-modules:     Control.Concurrent.Class.MonadMVar.Strict
   default-language:    Haskell2010
   build-depends:       base        >= 4.9 && <4.19,
-                       io-classes  >= 1.0 && <1.2
+                       io-classes  ^>= 1.1,
   ghc-options:         -Wall
                        -Wno-unticked-promoted-constructors
                        -Wcompat