Update dependency python-gitlab to v1.12.1

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
python-gitlab	minor	==1.11.0 -> ==1.12.1

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Release Notes

python-gitlab/python-gitlab

### [`v1.12.1`](https://togithub.com/python-gitlab/python-gitlab/releases/v1.12.1) [Compare Source](https://togithub.com/python-gitlab/python-gitlab/compare/v1.12.0...v1.12.1) ### Version 1.12.1 - 2019-10-07 ##### Bug Fixes fix: fix not working without auth provided ### [`v1.12.0`](https://togithub.com/python-gitlab/python-gitlab/releases/v1.12.0) [Compare Source](https://togithub.com/python-gitlab/python-gitlab/compare/v1.11.0...v1.12.0) ### Version 1.12.0 - 2019-10-06 ##### Features - add support for job token - **project:** - implement update_submodule - add file blame api - **user:** add status api ##### Bug Fixes - **cli:** fix cli command user-project list - **labels:** don't mangle label name on update - **todo:** mark_all_as_done doesn't return anything

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