Bump pysaml2 from 4.5.0 to 6.5.0

Bumps [pysaml2](https://github.com/IdentityPython/pysaml2) from 4.5.0 to 6.5.0.
- [Release notes](https://github.com/IdentityPython/pysaml2/releases)
- [Changelog](https://github.com/IdentityPython/pysaml2/blob/master/CHANGELOG.md)
- [Commits](IdentityPython/pysaml2@v4.5.0...v6.5.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

setup.py

@@ -29,7 +29,7 @@
     packages=setuptools.find_packages('src'),
     include_package_data=True,
     install_requires=[
-        'pysaml2==4.5.0',
+        'pysaml2==6.5.0',
         'PyYAML',
         'gevent==1.4.0',
         'requests==2.23.0',