core: bump python from 3.12.2-slim-bookworm to 3.12.3-slim-bookworm #19240

Job	Run time
lint (bandit)	2m 31s
test-migrations	3m 9s
lint (black)	2m 21s
lint (codespell)	2m 54s
lint (pending-migrations)	2m 40s
lint (ruff)	2m 35s
test-integration	5m 55s
test-migrations-from-stable - PostgreSQL 12-alpine	17m 55s
test-migrations-from-stable - PostgreSQL 15-alpine	18m 45s
test-migrations-from-stable - PostgreSQL 16-alpine	18m 36s
test-unittest - PostgreSQL 12-alpine	14m 23s
test-unittest - PostgreSQL 15-alpine	15m 25s
test-unittest - PostgreSQL 16-alpine	15m 4s
test-e2e (proxy)	5m 5s
test-e2e (oauth)	8m 46s
test-e2e (oauth-oidc)	6m 45s
test-e2e (saml)	6m 14s
test-e2e (ldap)	10m 21s
test-e2e (radius)	4m 47s
test-e2e (flows)	5m 0s
ci-core-mark	1s
build (amd64)	3m 59s
build (arm64)	15m 32s
pr-comment	5s
	3h 8m 48s

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