chore(deps): update all dependencies to v1.20.0

This MR contains the following updates:

Package	Type	Update	Change
apache/flink		minor	1.19.1 -> 1.20.0
flink	ironbank-docker	minor	1.19.1-scala_2.12 -> 1.20.0-scala_2.12
flink	stage	minor	1.19.1-scala_2.12 -> 1.20.0-scala_2.12

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