Bump org.keycloak:keycloak-core from 21.1.2 to 26.0.0

Bumps [org.keycloak:keycloak-core](https://github.com/keycloak/keycloak) from 21.1.2 to 26.0.0.
- [Release notes](https://github.com/keycloak/keycloak/releases)
- [Commits](keycloak/keycloak@21.1.2...26.0.0)

---
updated-dependencies:
- dependency-name: org.keycloak:keycloak-core
  dependency-type: direct:production
...

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

pom.xml

@@ -240,7 +240,7 @@
     <version.org.json>20231013</version.org.json>
     <version.org.jsoup>1.15.3</version.org.jsoup>
     <version.org.junit>5.5.2</version.org.junit>
-    <version.org.keycloak>21.1.2</version.org.keycloak>
+    <version.org.keycloak>26.0.0</version.org.keycloak>
     <version.org.mvel>2.5.2.Final</version.org.mvel>
     <version.org.apache.logging.log4j>2.17.1</version.org.apache.logging.log4j>
     <version.org.ocpsoft.prettytime>3.0.2.Final</version.org.ocpsoft.prettytime>