bump plotly version and edition to 2021 #365

Job	Run time
Rustfmt	11s
semver	1m 29s
Clippy	3m 25s
Code Coverage	1m 59s
Tests (ubuntu-latest)	1m 40s
Build Wasm Examples (wasm-yew-minimal)	53s
Build Examples (3d_charts)	34s
Tests (windows-latest)	3m 27s
Build Examples (basic_charts)	30s
Tests (macos-latest)	1m 58s
Build Examples (custom_controls)	31s
Build Examples (financial_charts)	31s
Build Examples (images)	43s
Build Examples (kaleido)	1m 35s
Build Examples (maps)	31s
Build Examples (ndarray)	30s
Build Examples (scientific_charts)	28s
Build Examples (shapes)	30s
Build Examples (subplots)	28s
	21m 53s

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