Update camundaVersion to v7.20.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.camunda.bpm.webapp:camunda-webapp-webjar (source)	7.19.0 -> 7.20.0
org.camunda.bpm:camunda-engine (source)	7.19.0 -> 7.20.0
org.camunda.bpm:camunda-bpm-assert (source)	7.19.0 -> 7.20.0

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Release Notes

camunda/camunda-bpm-platform (org.camunda.bpm.webapp:camunda-webapp-webjar)

### [`v7.20.0`](https://togithub.com/camunda/camunda-bpm-platform/compare/7.19.0...7.20.0) [Compare Source](https://togithub.com/camunda/camunda-bpm-platform/compare/7.19.0...7.20.0)

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[tobiasschaefer]

This dependency update will be taken care of in #488

[renovate[bot]]

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