skip urllib3 test on pypy3 (open-telemetry#1826)

Author: shalevr

tox.ini

@@ -93,7 +93,7 @@ envlist =
 
     ; opentelemetry-instrumentation-urllib3
     py3{7,8,9,10,11}-test-instrumentation-urllib3
-    pypy3-test-instrumentation-urllib3
+    ;pypy3-test-instrumentation-urllib3
 
     ; opentelemetry-instrumentation-requests
     py3{7,8,9,10,11}-test-instrumentation-requests