Need to upgrade Sarama To v1.30.0

[odacremolbap]

Describe the bug

Eventing e2e is failing due to dependency updates resolving Sarama to v1.30.0.
See sibling issue at eventing-kafka:

• workaround: Pin sarama version to v1.29.1 eventing-kafka#972
• fix: Upgrade Sarama To v0.30.0 eventing-kafka#975

That same upgrade should also happen at eventing-kafka-broker. This is one of the eventing PR logs showing the issue:

https://github.com/knative/eventing/runs/4120996132?check_suite_focus=true

# knative.dev/eventing-kafka-broker/control-plane/pkg/kafka [knative.dev/eventing-kafka-broker/control-plane/pkg/kafka.test]
control-plane/pkg/kafka/consumer_group_lag_test.go:136:117: cannot use tc.client (type *saramaClientMock) as type sarama.ClusterAdmin in return argument:
	*saramaClientMock does not implement sarama.ClusterAdmin (missing AlterClientQuotas method)
ok  	knative.dev/eventing-kafka-broker/control-plane/pkg/core/config	0.002s
FAIL	knative.dev/eventing-kafka-broker/control-plane/pkg/kafka [build failed]
?   	knative.dev/eventing-kafka-broker/control-plane/pkg/logging	[no test files]
ok  	knative.dev/eventing-kafka-broker/control-plane/pkg/receiver	0.001s
# knative.dev/eventing-kafka-broker/control-plane/pkg/reconciler/kafka/testing
control-plane/pkg/reconciler/kafka/testing/admin_mock.go:27:5: cannot use &MockKafkaClusterAdmin{} (type *MockKafkaClusterAdmin) as type sarama.ClusterAdmin in assignment:
	*MockKafkaClusterAdmin does not implement sarama.ClusterAdmin (missing AlterClientQuotas method)
ok  	knative.dev/eventing-kafka-broker/control-plane/pkg/reconciler/base	0.001s
FAIL	knative.dev/eventing-kafka-broker/control-plane/pkg/reconciler/broker [build failed]
ok  	knative.dev/eventing-kafka-broker/control-plane/pkg/reconciler/channel	0.003s
FAIL	knative.dev/eventing-kafka-broker/control-plane/pkg/reconciler/kafka [build failed]
FAIL	knative.dev/eventing-kafka-broker/control-plane/pkg/reconciler/sink [build failed]
FAIL	knative.dev/eventing-kafka-broker/control-plane/pkg/reconciler/source [build failed]

Expected behavior

Implement new interface for Sarama v1.30.0 libray.

Knative release version

knative-v1.0.0

[pierDipi]

Done in #1435

[pierDipi]

Thanks for your review!