Update gitlab-omniauth-openid-connect gem to support ECSDA keys

Diff:
https://my.diffend.io/gems/gitlab-omniauth-openid-connect/0.8.0/0.9.1

This commit also updates some other dependencies that appears to fix
verification of LetsEncrypt
(https://github.com/nahi/httpclient/issues/445) certs by making the
underlying HTTP client use the OS certificates:

- openid_connect: https://my.diffend.io/gems/openid_connect/1.2.0/1.3.0
- swd: https://my.diffend.io/gems/swd/1.1.0/1.2.0
- webfinger: https://my.diffend.io/gems/webfinger/1.1.0/1.2.0

Changelog: added