bump plotly version and edition to 2021 #374

Job	Run time
Rustfmt	12s
semver	1m 4s
Tests (ubuntu-latest)	1m 15s
Clippy	1m 18s
Tests (windows-latest)	53s
Build Examples (3d_charts)	23s
Build Wasm Examples (wasm-yew-minimal)	49s
Code Coverage	1m 16s
Build Examples (basic_charts)	25s
Tests (macos-latest)	1m 19s
Build Examples (custom_controls)	24s
Build Examples (financial_charts)	24s
Build Examples (images)	39s
Build Examples (kaleido)	1m 11s
Build Examples (maps)	24s
Build Examples (ndarray)	26s
Build Examples (scientific_charts)	23s
Build Examples (shapes)	26s
Build Examples (subplots)	25s
	13m 36s

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