[issue38693] Use f-strings instead of str.format within importlib

[Jason R. Coombs]

Change by Jason R. Coombs <jaraco at jaraco.com>:


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pull_requests: +24980
pull_request: https://github.com/python/cpython/pull/26387

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38693>
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