bump plotly version and edition to 2021 #372

Job	Run time
Rustfmt	11s
semver	1m 17s
Clippy	1m 32s
Code Coverage	2m 20s
Tests (ubuntu-latest)	2m 23s
Tests (windows-latest)	3m 40s
Tests (macos-latest)	4m 54s
Build Examples (3d_charts)	25s
Build Wasm Examples (wasm-yew-minimal)	52s
Build Examples (basic_charts)	27s
Build Examples (custom_controls)	23s
Build Examples (financial_charts)	25s
Build Examples (images)	46s
Build Examples (kaleido)	1m 36s
Build Examples (maps)	24s
Build Examples (ndarray)	25s
Build Examples (scientific_charts)	22s
Build Examples (shapes)	26s
Build Examples (subplots)	27s
	23m 15s

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