Change async-timeout pip version

Change-Id: I3a6501a7f0a824b20faadcbcd8504cd75132d314
Signed-off-by: Gulsum Atici <gulsum.atici@canonical.com>
diff --git a/requirements.txt b/requirements.txt
index 5995b6a..e0ad77e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,8 +16,10 @@
 #######################################################################################
 aiokafka==0.8.0
     # via -r requirements.in
-async-timeout==4.0.2
-    # via aiokafka
+async-timeout==3.0.1
+    # via
+    #   -r requirements.in
+    #   aiokafka
 dataclasses==0.6
     # via -r requirements.in
 kafka-python==2.0.2