Bump gds-sso from 21.1.0 to 22.0.0

Dependabot couldn't find the original pull request head commit, 917cc8a.

Author: dependabot[bot]

Gemfile.lock

@@ -209,7 +209,7 @@ GEM
       plek (>= 1.9.0)
       rack (>= 2.2.0)
       rest-client (~> 2.0)
-    gds-sso (21.1.0)
+    gds-sso (22.0.0)
       oauth2 (~> 2.0)
       omniauth (~> 2.1)
       omniauth-oauth2 (~> 1.8)