Unpin psutil dependency (#790)

* Unpin psutil dependency
* Update test for new psutil behavior

It is unlikely, but if the internal process cache is not
cleared, we could have a stale result.

---------

Co-authored-by: Lance T. Erickson <lancetarn@gmail.com>

Author: tim-schilling

setup.py

@@ -59,7 +59,7 @@
     },
     install_requires=[
         "asgiref",
-        "psutil>=5,<6",
+        "psutil>=5",
         "urllib3",
         "certifi",
         "wrapt>=1.10,<2.0",

tests/conftest.py

@@ -163,7 +163,11 @@ def core_agent_manager(core_agent_dir):
 
 
 def core_agent_is_running():
-    return any(p.name() == "core-agent" for p in psutil.process_iter(["name"]))
+    return any(
+        p.name() == "core-agent"
+        for p in psutil.process_iter(["name"])
+        if p.is_running()
+    )
 
 
 def terminate_core_agent_processes():