Bump gds-sso from 19.0.0 to 19.1.0

Bumps [gds-sso](https://github.com/alphagov/gds-sso) from 19.0.0 to 19.1.0.
- [Changelog](https://github.com/alphagov/gds-sso/blob/main/CHANGELOG.md)
- [Commits](alphagov/gds-sso@v19.0.0...v19.1.0)

---
updated-dependencies:
- dependency-name: gds-sso
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -166,12 +166,12 @@ GEM
       plek (>= 1.9.0)
       rack (>= 2.2.0)
       rest-client (~> 2.0)
-    gds-sso (19.0.0)
+    gds-sso (19.1.0)
       oauth2 (~> 2.0)
       omniauth (~> 2.1)
       omniauth-oauth2 (~> 1.8)
-      plek (>= 4, < 6)
-      rails (>= 6)
+      plek (>= 5)
+      rails (>= 7)
       warden (~> 1.2)
       warden-oauth2 (~> 0.0.1)
     globalid (1.2.1)
@@ -775,7 +775,7 @@ GEM
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.5.0)
     uri (0.13.0)
-    version_gem (1.1.3)
+    version_gem (1.1.4)
     warden (1.2.9)
       rack (>= 2.0.9)
     warden-oauth2 (0.0.1)