deps(docker): bump bitnami/cassandra from 4.1.5 to 4.1.6 in /docker/c… #6636

Job	Run time
docs	32s
gomod	52s
image_tags	1s
reno_lint	41s
lint	3m 33s
build (controller)	2m 25s
test (test)	10m 53s
build (kanctl)	2m 23s
test (integration-test)	6m 10s
build (kando)	2m 12s
test (helm-test)	2m 53s
release	11m 43s
release_example_docker_images / build_es-sidecar / build_image	7m 34s
release_example_docker_images / build_kafka-adobe-s3-source-connector / build_image	7m 12s
release_example_docker_images / build_cassandra / build_image	42s
release_example_docker_images / build_kafka-adobe-s3-sink-connector / build_image	7m 32s
release_example_docker_images / build_mssql-tools / build_image	34s
release_example_docker_images / build_mysql_sidecar / build_image	2m 8s
release_example_docker_images / build_mongodb / build_image	44s
release_example_docker_images / build_postgres-kanister-tools / build_image	5m 21s
release_example_docker_images / build_postgresql / build_image	5m 15s
	1h 21m 20s

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