Update dirs requirement from 5.0 to 6.0 #23

Job	Run time
Rustfmt	14s
semver	44s
Clippy	4m 8s
Build Wasm Examples (callback-example)	54s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	5m 40s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 56s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 54s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 10s
Build Book	3m 24s
Code Coverage	23s
Build Wasm Examples (basic)	57s
Build Examples (basic_charts)	35s
Build Examples (custom_controls)	26s
Build Examples (3d_charts)	34s
Build Examples (customization/density_mapbox_example)	23s
Build Examples (customization/consistent_static_format_export)	1m 15s
Build Examples (customization/multiple_plots_example)	29s
Build Examples (images)	46s
Build Examples (ndarray)	34s
Build Examples (financial_charts)	35s
Build Examples (kaleido)	1m 15s
Build Examples (shapes)	35s
Build Examples (scientific_charts)	29s
Build Examples (maps)	38s
Build Examples (themes)	25s
Build Examples (statistical_charts)	32s
Build Examples (subplots)	32s
	35m 27s

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