fix(deps): update dependency @bpmn-io/form-js-viewer to v1.6.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@bpmn-io/form-js-viewer (source)	1.6.0 -> 1.6.4

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Release Notes

bpmn-io/form-js (@​bpmn-io/form-js-viewer)

### [`v1.6.4`](https://togithub.com/bpmn-io/form-js/compare/v1.6.3...v1.6.4) [Compare Source](https://togithub.com/bpmn-io/form-js/compare/v1.6.3...v1.6.4) ### [`v1.6.3`](https://togithub.com/bpmn-io/form-js/compare/v1.6.2...v1.6.3) [Compare Source](https://togithub.com/bpmn-io/form-js/compare/v1.6.2...v1.6.3) ### [`v1.6.2`](https://togithub.com/bpmn-io/form-js/compare/v1.6.1...v1.6.2) [Compare Source](https://togithub.com/bpmn-io/form-js/compare/v1.6.1...v1.6.2) ### [`v1.6.1`](https://togithub.com/bpmn-io/form-js/compare/v1.6.0...v1.6.1) [Compare Source](https://togithub.com/bpmn-io/form-js/compare/v1.6.0...v1.6.1)

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