[issue27364] Deprecate invalid escape sequences in str/bytes

[Roundup Robot]

Roundup Robot added the comment:

New changeset b4cc62473c13 by R David Murray in branch 'default':
#27364: fix "incorrect" uses of escape character in the stdlib.
https://hg.python.org/cpython/rev/b4cc62473c13

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nosy: +python-dev

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