software/plantuml: version up 1.2022.7
The default "skin" changed, which results in diagram being grey instead of looking like rational rose. The previous behavior can be kept by using instruction `skin rose` in diagram code (see the changes in tests for example)
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![software/plantuml/test/data/test_class_diagram.png](https://lab.node.vifib.com/paul.graydon/slapos/-/raw/2491c2535813f2235b37f0e702b682ad5847c5ac/software/plantuml/test/data/test_class_diagram.png)
![software/plantuml/test/data/test_sequence_diagram.png](https://lab.node.vifib.com/paul.graydon/slapos/-/raw/2491c2535813f2235b37f0e702b682ad5847c5ac/software/plantuml/test/data/test_sequence_diagram.png)
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![software/plantuml/test/data/test_timing_diagram.png](https://lab.node.vifib.com/paul.graydon/slapos/-/raw/2491c2535813f2235b37f0e702b682ad5847c5ac/software/plantuml/test/data/test_timing_diagram.png)