build(deps): update syn requirement from 2 to 3 #290

Job	Run time
Code Coverage	10s
Build Wasm Examples (basic)	50s
Clippy	2m 38s
Build Book	1m 31s
Build Wasm Examples (callback-example)	50s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 12s
Build Examples (maps)	32s
semver	31s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	3m 59s
Build Examples (ndarray)	21s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	2m 1s
Build Examples (images)	43s
Build Examples (statistical_charts)	21s
Build Examples (kaleido)	1m 11s
Build Examples (customization/consistent_static_format_export)	1m 25s
Build Examples (financial_charts)	22s
Build Examples (3d_charts)	21s
Rustfmt	50s
Build Examples (basic_charts)	25s
Build Examples (scientific_charts)	18s
Build Examples (themes)	21s
Build Examples (shapes)	34s
Build Examples (customization/density_mapbox_example)	22s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 14s
Build Examples (customization/multiple_plots_example)	22s
Build Examples (subplots)	22s
Build Examples (custom_controls)	26s
	27m 12s

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