[issue26131] Raise ImportWarning when loader.load_module() is used

[Brett Cannon]

Change by Brett Cannon <brett at python.org>:


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pull_requests: +22359
stage: commit review -> patch review
pull_request: https://github.com/python/cpython/pull/23469

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26131>
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