Update Dep. Scanning supported languages

Remove a note saying that Dependency Scanning for Python
is limited to requirements.txt files, since setup.py
is also supported.

doc/user/application_security/dependency_scanning/index.md

@@ -58,7 +58,7 @@ The following languages and dependency managers are supported.
 | JavaScript ([npm](https://www.npmjs.com/), [yarn](https://yarnpkg.com/en/)) | yes | [gemnasium](https://gitlab.com/gitlab-org/security-products/gemnasium), [Retire.js](https://retirejs.github.io/retire.js)         |
 | Go ([Golang](https://golang.org/)) | not currently ([issue](https://gitlab.com/gitlab-org/gitlab-ee/issues/7132 "Dependency Scanning for Go")) | not available |
 | PHP ([Composer](https://getcomposer.org/))  | yes | [gemnasium](https://gitlab.com/gitlab-org/security-products/gemnasium) |
-| Python ([pip](https://pip.pypa.io/en/stable/)) (only `requirements.txt` supported)  | yes | [gemnasium](https://gitlab.com/gitlab-org/security-products/gemnasium) |
+| Python ([pip](https://pip.pypa.io/en/stable/)) | yes | [gemnasium](https://gitlab.com/gitlab-org/security-products/gemnasium) |
 | Python ([Pipfile](https://docs.pipenv.org/en/latest/basics/)) | not currently ([issue](https://gitlab.com/gitlab-org/gitlab-ee/issues/11756 "Pipfile.lock support for Dependency Scanning"))| not available |
 | Python ([poetry](https://poetry.eustace.io/)) | not currently ([issue](https://gitlab.com/gitlab-org/gitlab-ee/issues/7006 "Support Poetry in Dependency Scanning")) | not available |
 | Ruby ([gem](https://rubygems.org/)) | yes | [gemnasium](https://gitlab.com/gitlab-org/security-products/gemnasium), [bundler-audit](https://github.com/rubysec/bundler-audit) |