Update askama requirement from 0.13.0 to 0.14.0 #471

Job	Run time
Rustfmt	12s
Clippy	3m 4s
Build Examples (3d_charts)	32s
Build Wasm Examples (wasm-yew-minimal)	54s
Code Coverage	8s
Build Examples (basic_charts)	33s
semver	49s
Build Examples (custom_controls)	24s
Tests (ubuntu-latest)	1m 55s
Build Examples (financial_charts)	22s
Tests (windows-latest)	5m 14s
Build Examples (images)	48s
Tests (macos-latest)	1m 47s
Build Examples (kaleido)	1m 20s
Build Examples (maps)	29s
Build Examples (ndarray)	24s
Build Examples (scientific_charts)	26s
Build Examples (shapes)	23s
Build Examples (subplots)	27s
	20m 11s

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