Bump gitlab-omniauth-openid-connect to v0.8.0

This fixes issues with HS256-signed JWTs:
https://gitlab.com/gitlab-org/gitlab-omniauth-openid-connect/-/issues/1

Diff:
https://my.diffend.io/gems/gitlab-omniauth-openid-connect/0.4.0/0.8.0

Changelog: fixed

Gemfile

@@ -49,7 +49,7 @@ gem 'omniauth-shibboleth', '~> 1.3.0'
 gem 'omniauth-twitter', '~> 1.4'
 gem 'omniauth_crowd', '~> 2.4.0'
 gem 'omniauth-authentiq', '~> 0.3.3'
-gem 'gitlab-omniauth-openid-connect', '~> 0.4.0', require: 'omniauth_openid_connect'
+gem 'gitlab-omniauth-openid-connect', '~> 0.8.0', require: 'omniauth_openid_connect'
 gem 'omniauth-salesforce', '~> 1.0.5'
 gem 'omniauth-atlassian-oauth2', '~> 0.2.0'
 gem 'rack-oauth2', '~> 1.16.0'

Gemfile.lock

@@ -494,7 +494,7 @@ GEM
     gitlab-mail_room (0.0.9)
     gitlab-markup (1.7.1)
     gitlab-net-dns (0.9.1)
-    gitlab-omniauth-openid-connect (0.4.0)
+    gitlab-omniauth-openid-connect (0.8.0)
       addressable (~> 2.7)
       omniauth (~> 1.9)
       openid_connect (~> 1.2)
@@ -1493,7 +1493,7 @@ DEPENDENCIES
   gitlab-mail_room (~> 0.0.9)
   gitlab-markup (~> 1.7.1)
   gitlab-net-dns (~> 0.9.1)
-  gitlab-omniauth-openid-connect (~> 0.4.0)
+  gitlab-omniauth-openid-connect (~> 0.8.0)
   gitlab-sidekiq-fetcher (= 0.5.6)
   gitlab-styles (~> 6.2.0)
   gitlab_chronic_duration (~> 0.10.6.2)