python3-*: Update recipes to correctly check the upstream packages

With the upstream check migrated to the simple repo API, a number of the
recipes required updates to:
1. Remove outdated UPSTREAM_CHECK_REGEX checks
2. Add recipe specific UPSTREAM_CHECK_PYPI_PACKAGE definitions for
   packages that use '_', CamelCase, or other deviations from PEP625 in
   the source archive

Signed-off-by: Derek Straka <derek@asterius.io>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-flask_3.1.0.bb

@@ -12,9 +12,6 @@ SRC_URI += " \
         file://run-ptest \
 "
 
-UPSTREAM_CHECK_URI = "https://pypi.python.org/pypi/Flask"
-UPSTREAM_CHECK_REGEX = "/Flask/(?P<pver>(\d+[\.\-_]*)+)"
-
 inherit pypi python_setuptools_build_meta ptest
 
 CLEANBROKEN = "1"