bump plotly version and edition to 2021 #375

Job	Run time
Rustfmt	13s
semver	1m 12s
Build Wasm Examples (wasm-yew-minimal)	46s
Clippy	1m 18s
Build Examples (3d_charts)	24s
Code Coverage	1m 50s
Build Examples (basic_charts)	30s
Tests (ubuntu-latest)	2m 59s
Build Examples (custom_controls)	21s
Tests (windows-latest)	2m 44s
Build Examples (financial_charts)	21s
Tests (macos-latest)	2m 10s
Build Examples (images)	40s
Build Examples (kaleido)	1m 17s
Build Examples (maps)	20s
Build Examples (ndarray)	24s
Build Examples (scientific_charts)	21s
Build Examples (shapes)	26s
Build Examples (subplots)	21s
	18m 37s

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