sources/kerberos: use new python-kadmin implementation #25527

Job	Run time
lint (bandit)	3m 47s
lint (black)	3m 38s
test-migrations	4m 35s
lint (codespell)	3m 29s
lint (pending-migrations)	3m 51s
lint (ruff)	3m 27s
test-integration	6m 42s
test-e2e (proxy)	13m 8s
test-e2e (oauth)	9m 24s
test-migrations-from-stable - PostgreSQL 15-alpine	19m 31s
test-e2e (oauth-oidc)	7m 26s
test-unittest - PostgreSQL 15-alpine	18m 42s
test-migrations-from-stable - PostgreSQL 16-alpine	19m 24s
test-e2e (saml)	8m 30s
test-unittest - PostgreSQL 16-alpine	18m 25s
test-e2e (ldap)	12m 8s
test-e2e (radius)	6m 36s
test-e2e (scim)	6m 51s
test-e2e (flows)	6m 36s
ci-core-mark	1s
build (amd64)	11m 35s
build (arm64)	31m 1s
pr-comment	8s
	3h 38m 55s

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