Drop explicit setuptools requirement

Change-Id: I966b311669560a282caafea8eacf0ee43618704d
Related-Prod: PRODX-3456
diff --git a/requirements.txt b/requirements.txt
index 472085b..43abf78 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,4 +19,3 @@
 tempest>=17.1.0 # Apache-2.0
 gabbi>=1.42.1 # Apache-2.0
 kombu!=4.0.2,>=4.0.0 # BSD
-setuptools===58.0.0