update php and pimcore, fix deprecations #1066

Job	Run time
setup-matrix	4s
static-analysis (8.4, highest, 12.x-dev as 12.99.9, true, true) / Static analysis with phpstan	1m 22s
static-analysis (8.4, highest, false, true) / Static analysis with phpstan	1m 3s
static-analysis (8.1, lowest, false, false) / Static analysis with phpstan	54s
	3m 23s

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