The 'ldap' provider misses 'ldap' extra dep (which adds ldap3 pip dependency).
setup.py
'elasticsearch-dsl>=5.0.0',
]
exasol = [
    'pyexasol>=0.5.1,<1.0.0',
]
facebook = [
    'facebook-business>=6.0.2',
]
flask_oauth = [
    'Flask-OAuthlib>=0.9.1,<0.9.6',  
    'oauthlib!=2.0.3,!=2.0.4,!=2.0.5,<3.0.0,>=1.1.2',
    'requests-oauthlib<1.2.0',
]
google = [
    'PyOpenSSL',
    'google-ads>=4.0.0,<8.0.0',
    'google-api-python-client>=1.6.0,<2.0.0',
    'google-auth>=1.0.0,<2.0.0',
    'google-auth-httplib2>=0.0.1',
    'google-cloud-automl>=0.4.0,<2.0.0',
    'google-cloud-bigquery-datatransfer>=0.4.0,<2.0.0',
    'google-cloud-bigtable>=1.0.0,<2.0.0',
    'google-cloud-container>=0.1.1,<2.0.0',
    'google-cloud-datacatalog>=1.0.0,<2.0.0',
    'google-cloud-dataproc>=1.0.1,<2.0.0',
    'google-cloud-dlp>=0.11.0,<2.0.0',
    'google-cloud-kms>=2.0.0,<3.0.0',
    'google-cloud-language>=1.1.1,<2.0.0',
    'google-cloud-logging>=1.14.0,<2.0.0',
    'google-cloud-memcache>=0.2.0',