Allow network 3.0

commercialhaskell/stackage#4312

package.yaml

@@ -25,7 +25,7 @@ dependencies:
   base: '>= 4.9.0 && < 4.13'
   bytestring: '>= 0.10.8 && < 0.11'
   connection: '>= 0.2.6 && < 0.3'
-  network: '>= 2.6.3 && < 2.9'
+  network: '>= 2.6.3 && < 2.9 || >= 3.0.0 && < 3.1'
   websockets: '>= 0.9.7 && < 0.13'
 ghc-options:
   -Weverything