bump plotly version and edition to 2021 #370

Job	Run time
Rustfmt	10s
Clippy	3m 9s
Build Wasm Examples (wasm-yew-minimal)	51s
Build Examples (3d_charts)	25s
Code Coverage	1m 58s
Tests (ubuntu-latest)	1s
Build Examples (basic_charts)	25s
Tests (windows-latest)	5s
Build Examples (custom_controls)	22s
semver	1m 18s
Tests (macos-latest)	14m 54s
Build Examples (financial_charts)	24s
Build Examples (images)	45s
Build Examples (kaleido)	1m 11s
Build Examples (maps)	23s
Build Examples (ndarray)	30s
Build Examples (scientific_charts)	24s
Build Examples (shapes)	25s
Build Examples (subplots)	26s
	28m 6s

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