chore(renovate): Update Univention

This MR contains the following updates:

Package	Type	Update	Change
bitnami/nginx (source)	Univention	minor	1.25.4 -> 1.26.1
guardian-authorization-api-authorization-api	Univention	patch	2.0.0 -> 2.0.3
guardian-authorization-api-opa	Univention	patch	2.0.0 -> 2.0.3
guardian-management-api-management-api	Univention	patch	2.0.0 -> 2.0.2
guardian-management-ui-management-ui	Univention	patch	2.0.0 -> 2.0.2
nubus/charts/ums	Univention	minor	0.16.0 -> 0.17.0
nubus/images/data-loader	Univention	minor	0.45.2 -> 0.49.2
nubus/images/guardian-init	Univention	minor	0.4.0 -> 0.6.0
nubus/images/keycloak-handler	Univention	minor	0.4.0 -> 0.6.0
nubus/images/keycloak-proxy	Univention	minor	0.4.0 -> 0.6.0
nubus/images/ldap-notifier	Univention	minor	0.10.3 -> 0.15.2
nubus/images/ldap-server	Univention	minor	0.10.3 -> 0.15.2
nubus/images/notifications-api	Univention	minor	0.20.3 -> 0.24.1
nubus/images/ox-connector-standalone	Univention	digest	308489c -> 06b68bd
nubus/images/portal-frontend	Univention	minor	0.20.3 -> 0.24.1
nubus/images/portal-listener	Univention	minor	0.20.7 -> 0.24.1
nubus/images/portal-server	Univention	minor	0.20.3 -> 0.24.1
nubus/images/provisioning-dispatcher	Univention	minor	0.21.3 -> 0.28.0
nubus/images/provisioning-events-and-consumer-api	Univention	minor	0.21.3 -> 0.28.0
nubus/images/provisioning-prefill	Univention	minor	0.21.3 -> 0.28.0
nubus/images/provisioning-udm-listener	Univention	minor	0.21.3 -> 0.28.0
nubus/images/selfservice-invitation	Univention	minor	0.4.0 -> 0.6.2
nubus/images/udm-rest-api	Univention	minor	0.9.3 -> 0.13.2
nubus/images/umc-gateway	Univention	minor	0.11.6 -> 0.14.5
nubus/images/umc-server	Univention	minor	0.11.8 -> 0.14.5
nubus/images/wait-for-dependency	Univention	minor	0.20.3 -> 0.25.0
univention/intercom-service	Univention	digest	f32c1e5 -> 018efdc

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