Bump django from 4.2.28 to 4.2.29 #2500

Job	Run time
build-docker (linttest, docker/Dockerfile, linttest)	5m 32s
build-docker (internet.nl, docker/Dockerfile, app)	9m 59s
build-docker (grafana, docker/grafana.Dockerfile)	2m 24s
build-docker (util, docker/util.Dockerfile)	48s
build-docker (unbound, docker/Dockerfile, unbound)	2m 40s
build-docker (test-runner, docker/test-runner.Dockerfile)	4m 30s
build-docker (webserver, docker/webserver.Dockerfile)	3m 5s
test	2m 9s
batch-integration-test	7m 11s
development-environment-test	6m 35s
docs	5s
integration-test	8m 12s
lint/check	55s
	54m 5s

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