Don't require hashes for pip install

.taskcluster.yml

@@ -199,6 +199,7 @@ tasks:
                                         ${normProjectUpper}_HEAD_REV: '${head_sha}'
                                         ${normProjectUpper}_REPOSITORY_TYPE: git
                                         ${normProjectUpper}_PIP_REQUIREMENTS: taskcluster/requirements.txt
+                                        PIP_DISABLE_REQUIRE_HASHES: 1
                                         REPOSITORIES:
                                             $json:
                                                 ${normProject}: ${normProject}