Use lazy string formatting for logger

[tonybaloney]

This pull request primarily refactors the logging statements in the pytest_nunit/plugin.py file. The changes replace the usage of format() method for string formatting in the debug logs with the %s placeholder, which is a more preferred way for string formatting in logging.

Here are the key changes:

• pytest_nunit/plugin.py - def __init__(self, nodeid, nunit_xml):: Replaced the format() method with %s for string formatting in the debug log statement.
• pytest_nunit/plugin.py - def record_testreport(self, testreport):: Updated two debug log statements, replacing the format() method with %s for string formatting. [1] [2]

Fixes #68

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.42%. Comparing base (78f3a60) to head (35c979a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #77   +/-   ##
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  Coverage   92.42%   92.42%           
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  Files           5        5           
  Lines         541      541           
=======================================
  Hits          500      500           
  Misses         41       41           

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