make sure that SmallRng uses a unique seed per call #57

Job	Run time
Clippy	4m 10s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 16s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 48s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 5s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	5m 51s
semver	41s
Rustfmt	14s
Build Wasm Examples (callback-example)	49s
Code Coverage	12s
Build Wasm Examples (basic)	52s
Build Book	3m 34s
Build Examples (3d_charts)	25s
Build Examples (basic_charts)	27s
Build Examples (customization/consistent_static_format_export)	1m 19s
Build Examples (custom_controls)	31s
Build Examples (images)	43s
Build Examples (financial_charts)	30s
Build Examples (customization/multiple_plots_example)	29s
Build Examples (customization/density_mapbox_example)	27s
Build Examples (ndarray)	27s
Build Examples (kaleido)	1m 22s
Build Examples (shapes)	33s
Build Examples (subplots)	30s
Build Examples (maps)	42s
Build Examples (statistical_charts)	35s
Build Examples (themes)	33s
Build Examples (scientific_charts)	30s
	35m 35s

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