Update php to version v255 #1302

Job	Run time
build.20-true	24m 30s
build.22-true	21m 38s
build.20-false	4m 4s
build.22-false	3m 48s
unit.heroku-20.buildpack-clojure	4m 42s
unit.heroku-22.buildpack-clojure	3m 18s
unit.heroku-20.buildpack-go	3m 21s
unit.heroku-22.buildpack-go	3m 35s
unit.heroku-20.buildpack-gradle	3m 17s
unit.heroku-22.buildpack-gradle	2m 55s
unit.heroku-20.buildpack-java	4m 11s
unit.heroku-22.buildpack-java	2m 54s
unit.heroku-20.buildpack-multi	3m 56s
unit.heroku-22.buildpack-multi	3m 22s
unit.heroku-20.buildpack-nodejs	3m 34s
unit.heroku-22.buildpack-nodejs	3m 1s
unit.heroku-20.buildpack-null	3m 19s
unit.heroku-22.buildpack-null	3m 21s
unit.heroku-20.buildpack-php	3m 59s
unit.heroku-22.buildpack-php	2m 45s
unit.heroku-20.buildpack-play	4m 23s
unit.heroku-22.buildpack-play	4m 1s
unit.heroku-20.buildpack-python	3m 47s
unit.heroku-22.buildpack-python	3m 18s
unit.heroku-20.buildpack-ruby	4m 16s
unit.heroku-22.buildpack-ruby	3m 21s
unit.heroku-20.buildpack-scala	4m 36s
unit.heroku-22.buildpack-scala	4m 2s
unit.heroku-20.buildpack-static	4m 5s
unit.heroku-22.buildpack-static	3m 29s
	2h 28m 48s

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