bump plotly version and edition to 2021 #373

Job	Run time
semver	1m 19s
Rustfmt	11s
Clippy	1m 18s
Tests (ubuntu-latest)	1s
Tests (windows-latest)	3s
Build Wasm Examples (wasm-yew-minimal)	47s
Tests (macos-latest)	4s
Build Examples (3d_charts)	23s
Code Coverage	1m 31s
Build Examples (basic_charts)	25s
Build Examples (custom_controls)	24s
Build Examples (financial_charts)	28s
Build Examples (images)	37s
Build Examples (kaleido)	1m 30s
Build Examples (maps)	21s
Build Examples (ndarray)	23s
Build Examples (scientific_charts)	23s
Build Examples (shapes)	23s
Build Examples (subplots)	24s
	10m 55s

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