Remove http-conduit (<2.2.0) constraint

Since https://github.com/aristidb/aws/issues/206 is resolved, this
constraint is no longer necessary. However, http-conduit (>=2.2.0)
requires http-client (>=0.5.0) which introduces some breaking changes.
This commit also implements those changes depending on the version.
Fixes: https://git-annex.branchable.com/bugs/Build_with_aws_head_fails/

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

Remote/S3.hs

@@ -49,6 +49,12 @@ import Annex.Content
 import Annex.Url (withUrlOptions)
 import Utility.Url (checkBoth, managerSettings, closeManager)
 
+#if MIN_VERSION_http_client(0,5,0)
+import Network.HTTP.Client (responseTimeoutNone)
+#else
+responseTimeoutNone = Nothing
+#endif
+
 type BucketName = String
 
 remote :: RemoteType
@@ -430,7 +436,7 @@ withS3HandleMaybe c gc u a = do
   where
 	s3cfg = s3Configuration c
 	httpcfg = managerSettings
-		{ managerResponseTimeout = Nothing }
+		{ managerResponseTimeout = responseTimeoutNone }
 
 s3Configuration :: RemoteConfig -> S3.S3Configuration AWS.NormalQuery
 s3Configuration c = cfg