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.

.circleci/config.yml

@@ -14,6 +14,7 @@ common-steps:
         git clone https://github.com/freedomofpress/securedrop-debian-packaging.git
         cd securedrop-debian-packaging
         make install-deps
+        git checkout use_reproducible_wheels
         PKG_DIR=~/project make requirements
 
   - &verify_requirements
@@ -38,6 +39,7 @@ common-steps:
       name: Build debian package
       command: |
         cd ~/packaging/securedrop-debian-packaging
+        git checkout use_reproducible_wheels
         export PKG_VERSION=1000.0
         export PKG_PATH=/home/circleci/project/dist/securedrop-log-$PKG_VERSION.tar.gz
         make securedrop-log

build-requirements.txt

@@ -1 +1 @@
-redis==3.3.11 --hash=sha256:022f124431ae16ee3a3a69c8016e3e2b057b4f4e0bfa7787b6271d893890c3cc
+redis==3.3.11 --hash=sha256:974926675d246ade47a101e305596a0f50282a405a03b7173a70d99c79e6370c