fix(deps): update keycloak.version to v26.3.4

Author: renovate[bot]

unique-attribute-validator-provider/pom.xml

@@ -12,7 +12,7 @@
         <maven.compiler.source>21</maven.compiler.source>
         <maven.compiler.target>21</maven.compiler.target>
         <jboss.logging.version>3.4.1.Final</jboss.logging.version>
-        <keycloak.version>26.3.3</keycloak.version>
+        <keycloak.version>26.3.4</keycloak.version>
     </properties>
 
     <dependencies>