Upgrade ubuntu to 22.04 (CrayLabs#558)

Bump ubuntu to version 22.04

[ committed by @AlyssaCote ]
[ reviewed by @ashao ]

doc/changelog.rst

@@ -19,6 +19,7 @@ To be released at some future point in time
 Description
 
 - Fix race condition for telemetry monitor
+- Upgrade ubuntu to 22.04
 - Remove helper function ``init_default``
 - Fix telemetry monitor logging errrors for task history
 - Change default path for entities
@@ -45,6 +46,8 @@ Description
 Detailed Notes
 
 - Ensure the telemetry monitor is started prior to launching entities (SmartSim-PR549_)
+- After dropping support for Python 3.8, ubuntu needs to be upgraded.
+  (SmartSim-PR558_)
 - Remove helper function ``init_default`` and replace with traditional type
   narrowing. (SmartSim-PR545_)
 - Ensure the telemetry monitor does not track a task_id 
@@ -113,6 +116,7 @@ Detailed Notes
   the previously registered signal handler. (SmartSim-PR535_)
 
 .. _SmartSim-PR549: https://github.com/CrayLabs/SmartSim/pull/549
+.. _SmartSim-PR558: https://github.com/CrayLabs/SmartSim/pull/558
 .. _SmartSim-PR545: https://github.com/CrayLabs/SmartSim/pull/545
 .. _SmartSim-PR557: https://github.com/CrayLabs/SmartSim/pull/557
 .. _SmartSim-PR533: https://github.com/CrayLabs/SmartSim/pull/533