Tell Dependabot to vendor dependencies when updating them #1952

Job	Run time
check-application-mapping (8.3)	14s
check-file-patterns (8.3)	4s
composer-dependency-analyser (8.3)	11s
check-makefile (8.3)	10s
composer-validate (8.3)	6s
info (8.3)	13s
lint-latte (8.3)	9s
lint-neon (8.3)	9s
lint-php (8.3)	15s
lint-xml	11s
phpcs (8.3)	18s
phpstan (8.3)	25s
phpstan-vendor (8.3)	1m 17s
psalm (8.3)	17s
tester (8.3)	16s
	4m 15s

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