bump plotly version and edition to 2021 #366

Job	Run time
semver	22s
Rustfmt	12s
Clippy	36s
Build Examples (3d_charts)	31s
Code Coverage	34s
Build Examples (basic_charts)	34s
Build Examples (custom_controls)	30s
Build Wasm Examples (wasm-yew-minimal)	36s
Build Examples (financial_charts)	33s
Tests (ubuntu-latest)	34s
Build Examples (images)	35s
Tests (windows-latest)	27s
Build Examples (kaleido)	35s
Tests (macos-latest)	36s
Build Examples (maps)	32s
Build Examples (ndarray)	31s
Build Examples (scientific_charts)	30s
Build Examples (shapes)	31s
Build Examples (subplots)	29s
	9m 48s

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