servant-auth-swagger: Excluding building against GHC 9.0

(need base > 4.15 but swagger exclude it)

servant-auth/servant-auth-swagger/servant-auth-swagger.cabal

@@ -15,7 +15,7 @@ maintainer:     jkarni@gmail.com
 copyright:      (c) Julian K. Arni
 license:        BSD3
 license-file:   LICENSE
-tested-with:    GHC ==8.6.5 || ==8.8.4 || ==8.10.4 || ==9.0.1
+tested-with:    GHC ==8.6.5 || ==8.8.4 || ==8.10.4
 build-type:     Simple
 cabal-version:  >= 1.10
 extra-source-files:
@@ -38,6 +38,8 @@ library
     , servant         >= 0.13    && < 0.19
     , servant-auth    == 0.4.*
     , lens            >= 4.16.1  && < 5.1  
+  if impl(ghc >= 9)
+    buildable: False
   exposed-modules:
       Servant.Auth.Swagger
   default-language: Haskell2010
@@ -59,6 +61,8 @@ test-suite spec
     , servant
     , servant-auth
     , lens
+  if impl(ghc >= 9)
+    buildable: False
     
   -- test dependencies
   build-depends: