bump plotly version and edition to 2021 #362

Job	Run time
semver	1m 15s
Rustfmt	16s
Code Coverage	1m 58s
Clippy	1m 52s
Build Wasm Examples (wasm-yew-minimal)	26s
Build Examples (3d_charts)	30s
Build Examples (basic_charts)	32s
Tests (ubuntu-latest)	1m 52s
Build Examples (custom_controls)	29s
Tests (windows-latest)	3m 29s
Build Examples (financial_charts)	29s
Tests (macos-latest)	1m 55s
Build Examples (images)	22s
Build Examples (kaleido)	1m 29s
Build Examples (maps)	31s
Build Examples (ndarray)	31s
Build Examples (scientific_charts)	30s
Build Examples (shapes)	29s
Build Examples (subplots)	29s
	19m 24s

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