Tweak the way the debug strategy imports the linear strategy parent

Due to the way we load plugins, internally to Python there can be issues when
the debug strategy is loaded after the linear strategy. To work around this,
we're changing the import line for the linear strategy to avoid the problem.

Related to #16825

lib/ansible/plugins/strategy/debug.py

@@ -6,7 +6,7 @@ import cmd
 import pprint
 import sys
 
-from ansible.plugins.strategy import linear
+from ansible.plugins.strategy.linear import StrategyModule as LinearStrategyModule
 
 try:
     from __main__ import display
@@ -25,7 +25,7 @@ class NextAction(object):
         self.result = result
 
 
-class StrategyModule(linear.StrategyModule):
+class StrategyModule(LinearStrategyModule):
     def __init__(self, tqm):
         self.curr_tqm = tqm
         super(StrategyModule, self).__init__(tqm)