Update strimzi/jmxtrans Docker tag to v0.20.1

This MR contains the following updates:

Package	Type	Update	Change
strimzi/jmxtrans	ironbank-docker	patch	0.20.0 -> 0.20.1
strimzi/jmxtrans		patch	0.20.0 -> 0.20.1
strimzi/jmxtrans	stage	patch	0.20.0 -> 0.20.1

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