chore: add integrity attribute to external links #5313

Job	Run time
Build Docker image	7m 28s
Build application and assets	6m 9s
file_changes	7s
Linting / TypeScript	39s
Unit tests / JavaScript / Mocha	50s
Linting / JavaScript	30s
Linting / Elixir	3m 29s
Linting / CSS	24s
Formatting / Elixir	3m 20s
Formatting / JavaScript & TypeScript	29s
Unit tests / JavaScript & TypeScript / Jest	2m 11s
Type checks / Elixir	3m 51s
Type checks / TypeScript	32s
Unit tests / Elixir / mix coveralls.html	1m 2s
	31m 1s

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