Update dependency com.structurizr:structurizr-dsl to v1.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.structurizr:structurizr-dsl	1.20.0 -> 1.21.0

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Release Notes

structurizr/dsl

v1.21.0

• Fixes #​153 (Error when deploymentNode identifier is the same as a softwareSystem or container identifier)
• Adds support for custom elements on dynamic views.
• The DSL parser will now throw an error if the enterprise is set more than once (#​159).
• Adds the ability to set name/value properties on element and relationship styles.
• Adds support for setting element style stroke widths.
• Adds name-value properties to views.
• Adds support for using theme and themes inside the styles block.
• Breaking change: Dynamic views will no longer create relationships that don't exist in the model.

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Configuration

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