Revert "Remove http2 upper bound alcidesv/second-transfer#2"

This reverts commit e6f5126541.

build-constraints.yaml

@@ -1172,6 +1172,9 @@ packages:
         # https://github.com/fpco/stackage/issues/666
         - tar < 0.4.2
 
+        # https://github.com/alcidesv/second-transfer/issues/2
+        - http2 < 1.0
+
 # Package flags are applied to individual packages, and override the values of
 # global-flags
 package-flags: