bump plotly version and edition to 2021 #367

Job	Run time
semver	1m 17s
Clippy	3m 2s
Build Wasm Examples (wasm-yew-minimal)	56s
Build Examples (3d_charts)	32s
Code Coverage	2m 26s
Rustfmt	14s
Build Examples (basic_charts)	36s
Tests (ubuntu-latest)	1m 53s
Build Examples (custom_controls)	30s
Tests (windows-latest)	3m 39s
Tests (macos-latest)	1m 54s
Build Examples (financial_charts)	31s
Build Examples (images)	49s
Build Examples (kaleido)	1m 17s
Build Examples (maps)	35s
Build Examples (ndarray)	31s
Build Examples (scientific_charts)	28s
Build Examples (shapes)	35s
Build Examples (subplots)	31s
	22m 16s

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