bump plotly version and edition to 2021 #369

Job	Run time
Rustfmt	14s
semver	1m 10s
Build Wasm Examples (wasm-yew-minimal)	47s
Build Examples (3d_charts)	24s
Clippy	2m 56s
Code Coverage	1m 52s
Build Examples (basic_charts)	31s
Tests (ubuntu-latest)	2m 15s
Build Examples (custom_controls)	21s
Tests (windows-latest)	3m 32s
Build Examples (financial_charts)	24s
Tests (macos-latest)	3m 47s
Build Examples (images)	37s
Build Examples (kaleido)	1m 14s
Build Examples (maps)	24s
Build Examples (ndarray)	24s
Build Examples (scientific_charts)	22s
Build Examples (shapes)	29s
Build Examples (subplots)	23s
	22m 6s

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