Update darling requirement from 0.21 to 0.22 #122

Job	Run time
Rustfmt	14s
Clippy	4m 5s
semver	59s
Build Book	3m 37s
Build Wasm Examples (callback-example)	53s
Build Wasm Examples (basic)	52s
Code Coverage	11s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 1s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 3s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 56s
Build Examples (customization/consistent_static_format_export)	1m 21s
Build Examples (customization/density_mapbox_example)	30s
Build Examples (basic_charts)	35s
Build Examples (custom_controls)	26s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	6m 24s
Build Examples (3d_charts)	34s
Build Examples (financial_charts)	34s
Build Examples (kaleido)	1m 18s
Build Examples (customization/multiple_plots_example)	33s
Build Examples (statistical_charts)	36s
Build Examples (subplots)	27s
Build Examples (maps)	59s
Build Examples (scientific_charts)	29s
Build Examples (shapes)	35s
Build Examples (themes)	44s
Build Examples (ndarray)	34s
Build Examples (images)	50s
	37m 20s

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