Bump base >= 4.9; remove tested-with: 7.x

we turned off CI for 7.x last year

Author: lambdageek

unbound-generics.cabal

@@ -28,7 +28,7 @@ extra-source-files:  examples/*.hs, examples/*.lhs,
                      README.md,
                      Changelog.md
 
-tested-with: GHC == 7.8.4, GHC == 7.10.3, GHC == 8.0.2, GHC == 8.2.2, GHC == 8.4.4, GHC == 8.6.5, GHC == 8.8.4, GHC == 8.10.7, GHC == 9.0.2, GHC == 9.2.*, GHC == 9.4.*
+tested-with: GHC == 8.0.2, GHC == 8.2.2, GHC == 8.4.4, GHC == 8.6.5, GHC == 8.8.4, GHC == 8.10.7, GHC == 9.0.2, GHC == 9.2.*, GHC == 9.4.*
 
 library
   exposed-modules:     Unbound.Generics.LocallyNameless
@@ -52,7 +52,7 @@ library
                        Unbound.Generics.LocallyNameless.Subst
   -- other-modules:
   -- other-extensions:
-  build-depends:       base >=4.6 && <5,
+  build-depends:       base >=4.9 && <5,
                        template-haskell >= 2.8.0.0,
                        deepseq >= 1.3.0.0,
                        mtl >= 2.1,