Add psutil dependency (#1121)

* Add psutil dependency

Fixes #1120

* Update instrumentation/opentelemetry-instrumentation-system-metrics/setup.cfg

Co-authored-by: Srikanth Chekuri <[email protected]>

Co-authored-by: Srikanth Chekuri <[email protected]>

Author: ocelotl

instrumentation/opentelemetry-instrumentation-system-metrics/setup.cfg

@@ -42,6 +42,7 @@ packages=find_namespace:
 install_requires =
     opentelemetry-api ~= 1.11
     opentelemetry-sdk ~= 1.11
+    psutil ~= 5.9
 
 [options.extras_require]
 test =