chore(deps): update quay.io/keycloak/keycloak docker tag to v26 #3057

Job	Run time
build (notify, src/) / build	4m 40s
build (list, src/list/) / build	4m 15s
build (query, src/) / build	4m 44s
build (list, src/list/) / sign image	0s
build (list, src/list/) / provenance	0s
build (notify, src/) / provenance	0s
build (notify, src/) / sign image	0s
build (query, src/) / sign image	0s
build (query, src/) / provenance	0s
test (query, tests/e2e/)	2m 54s
test (notify, tests/e2e/)	1m 35s
k8s-test / test	6m 58s
docker-compose-test / test	5m 57s
release	0s
	31m 3s

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