Switch network 2.6 back on (cabal-install released)

build-constraints.yaml

@@ -602,10 +602,6 @@ packages:
         - product-profunctors
 
     "Stackage upper bounds":
-        # cabal-install is buggy still.
-        - network < 2.6
-        - network-uri < 2.6
-
         # https://github.com/fpco/stackage/issues/288
         - text < 1.2
 
@@ -643,7 +639,7 @@ global-flags:
     new-base: true
     bytestring-in-base: false
     test-hlint: false
-    network-uri: false # network-uri: true
+    network-uri: true
 
 # Package flags are applied to individual packages, and override the values of
 # global-flags