Uses new reproducible wheels from our builds

The new wheels are coming in the following PR:

freedomofpress/securedrop-builder#213

These wheels are reproducible, you can build them following our
Makefile.

build-requirements.txt

@@ -1,10 +1,10 @@
-certifi==2018.10.15 --hash=sha256:173b19dd31ca7faa50d1fcc0eaf30f5e32e8e99e17d8c7fd4cfc8bc8d94e18a6
-chardet==3.0.4 --hash=sha256:f5632e583a4f61f1e16d0cc98127d241fb11c3c6ddfddee159307d4215186837
-furl==2.0.0 --hash=sha256:1855003e64dcb934556ad79994ba1a3a852da337e353d84d3b4ef75031913451
-idna==2.7 --hash=sha256:491f674364ba3232ed1eb4c1eb7407887f62cef6c300aad7df6e01acd88ffb25
-orderedmultidict==1.0 --hash=sha256:51efddca0b4ae6d885bbafd8ca44e51758166c144cf006dbead5c9394b2a9eae
-pyyaml==5.3.1 --hash=sha256:cb4442140d3195f5f799096aa35aadce15f493046135a03668023b80824dd44c
-requests==2.22.0 --hash=sha256:e3711bd465fd013abe428a8dade2938b578f05d2b06b0ae83daa98869c4548e8
-six==1.11.0 --hash=sha256:aa4ad34049ddff178b533062797fd1db9f0038b7c5c2461a7cde2244300b9f3d
-urllib3==1.25.10 --hash=sha256:32bcd1ec52a4dd17ede2725ad166c789f50d402870947d6824598915b89ecf70
-werkzeug==0.16.0 --hash=sha256:429de1b931a2a58bf5cfac8447253949f7a930d30a73f2755e0ad0f9824592bf
+certifi==2018.10.15 --hash=sha256:2d5538b9d89b3a9cb423b8f08417c657856cab733d560067e864157f71b1c5aa
+chardet==3.0.4 --hash=sha256:e5cf39014befb85add77118fdc946f0a3387df7840235ba5d20fd6e3a672410a
+furl==2.0.0 --hash=sha256:9f50360f6e4a0f1d0a35fb4997878e7186a73331f0fde5f6fc9b1bb9f006e6cc
+idna==2.7 --hash=sha256:a967a752dba5492be34f30f8633cee512d2ec923fe3a2e201d87353b540d2955
+orderedmultidict==1.0 --hash=sha256:f6022beda2b3387c61e6eb7e0e1e3e2832fd9f55f3f64d4b4b226eea7487327f
+pyyaml==5.3.1 --hash=sha256:ff021f812a5dbaeb10678462952bb447bf6b322ab54923f5591811056a827c15
+requests==2.22.0 --hash=sha256:83ddbb326afd5524e7fbca582fd9673103652ea3b0c6601ac5ba1a4501f077c9
+six==1.11.0 --hash=sha256:eb52689b06ca7433c1cac3b91f320400bd3b358790b7ff4b6367cb1c81d37561
+urllib3==1.25.10 --hash=sha256:c78fdeffd1a01640ea99d35851539a4bc91e46a672989c4d96663e3808121389
+werkzeug==0.16.0 --hash=sha256:bd05301a84a9bc3b33f178e53446181879744b74f098ed35850ba21125379be1