bump plotly version and edition to 2021 #363

Job	Run time
Clippy	1m 45s
Tests (ubuntu-latest)	1m 55s
Build Wasm Examples (wasm-yew-minimal)	27s
Tests (windows-latest)	3m 50s
Code Coverage	1m 57s
Build Examples (3d_charts)	30s
Tests (macos-latest)	1m 46s
Rustfmt	14s
Build Examples (basic_charts)	30s
semver	1m 22s
Build Examples (custom_controls)	28s
Build Examples (financial_charts)	29s
Build Examples (images)	22s
Build Examples (kaleido)	1m 38s
Build Examples (maps)	28s
Build Examples (ndarray)	29s
Build Examples (scientific_charts)	30s
Build Examples (shapes)	33s
Build Examples (subplots)	28s
	19m 41s

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