Update click requirement from ~=6.7 to ~=7.1 (#266)

Updates the requirements on [click](https://github.com/pallets/click) to permit the latest version.
- [Release notes](https://github.com/pallets/click/releases)
- [Changelog](https://github.com/pallets/click/blob/master/CHANGES.rst)
- [Commits](pallets/click@6.7...7.1.2)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 alembic~=0.9.8
 astroid~=2.4.0
 blinker~=1.4
-click~=6.7
+click~=7.1
 csh_ldap>=2.3.1
 Flask~=1.1.0
 Flask-Migrate~=2.1.1