Maintenance: Pin dependency keycloak-admin to fix version

Gemfile

@@ -257,7 +257,7 @@ group :development, :test do
   gem 'localhost'
 
   # Keycloak admin tool for setting up SAML auth tests
-  gem 'keycloak-admin', git: 'https://github.com/tschaefer/ruby-keycloak-admin/', branch: 'main', require: false
+  gem 'keycloak-admin', github: 'tschaefer/ruby-keycloak-admin', tag: 'v26.0.0', require: false
 
   # Debugging and profiling
   gem 'pry-doc' # This gem is very large, so don't include it in production.

Gemfile.lock

@@ -1,9 +1,9 @@
 GIT
-  remote: https://github.com/tschaefer/ruby-keycloak-admin/
-  revision: 7ea4e62d77fad93fc2da840c3f8bd5c45588d131
-  branch: main
+  remote: https://github.com/tschaefer/ruby-keycloak-admin.git
+  revision: c07dc051f6d21ed59509a82cd17ff386f36f8931
+  tag: v26.0.0
   specs:
-    keycloak-admin (23.0.7)
+    keycloak-admin (26.0.0)
       hashie (~> 5.0.0)
       httparty (~> 0.21.0)