Bump omniauth-gitlab to 1.0.3

This version of the gem uses API v4 by default:

https://github.com/linchus/omniauth-gitlab/commit/fd13de9f251fdaa72ba0195bda47cd2cb8731084

Gemfile.lock

@@ -540,7 +540,7 @@ GEM
     omniauth-github (1.3.0)
       omniauth (~> 1.5)
       omniauth-oauth2 (>= 1.4.0, < 2.0)
-    omniauth-gitlab (1.0.2)
+    omniauth-gitlab (1.0.3)
       omniauth (~> 1.0)
       omniauth-oauth2 (~> 1.0)
     omniauth-google-oauth2 (0.5.3)

changelogs/unreleased/sh-bump-omniauth-gitlab.yml

+---
+title: Bump omniauth-gitlab to 1.0.3
+merge_request:
+author:
+type: changed