chore(deps): update quay.io/keycloak/keycloak docker tag to v26.2.1

Author: Renovate Bot

keycloak/Dockerfile

@@ -10,7 +10,7 @@ RUN dnf install --installroot /mnt/rootfs curl --releasever 9 --setopt install_w
     rpm --root /mnt/rootfs -e --nodeps setup
 
 # Second stage: build keycloak image
-FROM quay.io/keycloak/keycloak:26.1.4
+FROM quay.io/keycloak/keycloak:26.2.1
 
 # Copy curl from the first stage
 COPY --from=ubi-micro-build /mnt/rootfs /