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Bump serialize-javascript and mocha in /assets (#2091) #2389

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Run time

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Job	Run time
assets (1.17, 27, 18.x)	54s
elixir (1.15, 25)	37s
elixir (1.16, 26)	38s
elixir (1.17, 27)	39s
elixir (1.18, 27, true)	43s
	3m 31s