Bump squizlabs/php_codesniffer from 3.7.2 to 3.13.6 #1955

Job	Run time
UI Tests (9.1.x, 9.1.x, 8.4, classic)	6m 4s
UI Tests (nightly, nightly, 8.4, hummingbird)	7m 41s
UI Tests (9.0.3, 9.0.3-3.0-classic, 8.4, classic)	7m 52s
UI Tests (9.2.x, 9.2.x, 8.4, hummingbird)	7m 23s
Nightly Report	-1s
	28m 59s

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