Bump org.keycloak:keycloak-authz-client from 19.0.1 to 26.0.4

Bumps org.keycloak:keycloak-authz-client from 19.0.1 to 26.0.4.

---
updated-dependencies:
- dependency-name: org.keycloak:keycloak-authz-client
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

backend/pom.xml

@@ -313,7 +313,7 @@
         <dependency>
             <groupId>org.keycloak</groupId>
             <artifactId>keycloak-authz-client</artifactId>
-            <version>19.0.1</version>
+            <version>26.0.4</version>
         </dependency>
         <dependency>
             <groupId>org.apache.arrow</groupId>