Bump upper bound on base library

Author: UlfNorell

agda-stdlib-utils.cabal

@@ -15,7 +15,7 @@ executable GenerateEverything
   hs-source-dirs:   .
   main-is:          GenerateEverything.hs
   default-language: Haskell2010
-  build-depends:      base >= 4.9.0.0 && < 4.15
+  build-depends:      base >= 4.9.0.0 && < 4.16
                     , directory >= 1.0.0.0 && < 1.4
                     , filemanip >= 0.3.6.2 && < 0.4
                     , filepath >= 1.4.1.0 && < 1.5
@@ -24,6 +24,6 @@ executable AllNonAsciiChars
   hs-source-dirs:   .
   main-is:          AllNonAsciiChars.hs
   default-language: Haskell2010
-  build-depends:      base >= 4.9.0.0 && < 4.15
+  build-depends:      base >= 4.9.0.0 && < 4.16
                     , filemanip >= 0.3.6.2 && < 0.4
                     , text >= 1.2.3.0 && < 1.3