[improve] Upgrade pulsar-client-python to 3.7.0 in Docker image (apache#24302)

(cherry picked from commit 0b07edc)
(cherry picked from commit bd42a1d)

Author: lhotari

pom.xml

@@ -82,7 +82,7 @@ flexible messaging model and an intuitive client API.</description>
     <pulsar.broker.compiler.release>${maven.compiler.target}</pulsar.broker.compiler.release>
     <pulsar.client.compiler.release>8</pulsar.client.compiler.release>
 
-    <pulsar.client.python.version>3.5.0</pulsar.client.python.version>
+    <pulsar.client.python.version>3.7.0</pulsar.client.python.version>
 
     <UBUNTU_MIRROR>http://archive.ubuntu.com/ubuntu/</UBUNTU_MIRROR>
     <UBUNTU_SECURITY_MIRROR>http://security.ubuntu.com/ubuntu/</UBUNTU_SECURITY_MIRROR>