[3.12] gh-107715: Escape class name in regular expression (GH-107716) (#107726)

* gh-107715: Escape class name in regular expression (GH-107716)

This patch escapes the class name before embedding it in the regular expression
for `pat` in `doctest.DocTestFinder._find_lineno`. While class names do not
ordinarily contain special characters, it is possible to encounter these when a
class is created dynamically. Escaping the name will correctly return `None` in
this scenario, rather than potentially matching a different class or raising
`re.error` depending on the symbols used.
(cherry picked from commit 85793278793708ad6b7132a54ac9fb4b2c5bcac1)

Co-authored-by: Gertjan van Zwieten <git@gjvz.nl>

* Update 2023-08-07-14-12-07.gh-issue-107715.238r2f.rst

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Co-authored-by: Gertjan van Zwieten <git@gjvz.nl>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>