Update bower.json to latest purescript-aff

because I've got error on spago publish

❌ Could not solve the package dependencies, errors:
  While solving node-streams each version could not be solved:
- 9.0.0:
  Conflict in version ranges for aff:
    >=8.0.0 (declared dependency)
    <8.0.0 seen in [email protected]

Author: srghma

bower.json

@@ -25,6 +25,6 @@
     "purescript-nullable": "^6.0.0",
     "purescript-prelude": "^6.0.0",
     "purescript-node-event-emitter": "https://github.com/purescript-node/purescript-node-event-emitter.git#^3.0.0",
-    "purescript-aff": "^7.1.0"
+    "purescript-aff": "^8.0.0"
   }
 }