bump plotly version and edition to 2021 #361

Job	Run time
Clippy	38s
Tests (ubuntu-latest)	32s
Build Wasm Examples (wasm-yew-minimal)	24s
Tests (windows-latest)	1m 34s
Build Examples (3d_charts)	31s
Code Coverage	39s
Tests (macos-latest)	36s
Rustfmt	11s
Build Examples (basic_charts)	33s
semver	1m 23s
Build Examples (custom_controls)	28s
Build Examples (financial_charts)	30s
Build Examples (images)	21s
Build Examples (kaleido)	1m 39s
Build Examples (maps)	30s
Build Examples (ndarray)	31s
Build Examples (scientific_charts)	30s
Build Examples (shapes)	30s
Build Examples (subplots)	28s
	12m 28s

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