fix(deps): update keycloak.version to v26.7.3 (#486)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -9,7 +9,7 @@
     <version>6.2.3-SNAPSHOT</version>
     <properties>
         <java.version>21</java.version>
-        <keycloak.version>26.7.2</keycloak.version>
+        <keycloak.version>26.7.3</keycloak.version>
         <mockito.version>5.23.0</mockito.version>
 
         <maven.compiler.target>${java.version}</maven.compiler.target>