Update darling requirement from 0.21 to 0.22 #121

Job	Run time
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 3s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 19s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	6m 38s
Code Coverage	15s
semver	1m 0s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	5m 3s
Build Book	3m 47s
Build Wasm Examples (basic)	55s
Rustfmt	17s
Build Wasm Examples (callback-example)	51s
Clippy	4m 15s
Build Examples (basic_charts)	32s
Build Examples (3d_charts)	36s
Build Examples (customization/consistent_static_format_export)	1m 25s
Build Examples (customization/multiple_plots_example)	28s
Build Examples (customization/density_mapbox_example)	30s
Build Examples (images)	51s
Build Examples (financial_charts)	34s
Build Examples (custom_controls)	43s
Build Examples (maps)	43s
Build Examples (kaleido)	1m 27s
Build Examples (shapes)	45s
Build Examples (scientific_charts)	40s
Build Examples (themes)	33s
Build Examples (ndarray)	33s
Build Examples (subplots)	30s
Build Examples (statistical_charts)	33s
	40m 46s

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