Update PHP Version. Introduce Alpine 3.20. ReadME update #209

Job	Run time
build (alpine/3.17/8.1/Dockerfile, spryker/php:8.1-alpine3.17, linux/amd64, linux/arm64)	31m 21s
build (alpine/3.17/8.2/Dockerfile, spryker/php:8.2-alpine3.17, linux/amd64, linux/arm64)	32m 25s
build (alpine/3.18/8.1/Dockerfile, spryker/php:8.1-alpine3.18, linux/amd64, linux/arm64)	47m 24s
build (alpine/3.18/8.2/Dockerfile, spryker/php:8.2-alpine3.18, linux/amd64, linux/arm64)	49m 7s
build (alpine/3.19/8.1/Dockerfile, spryker/php:8.1, spryker/php:8.1-alpine3.19, linux/amd64, linu...	50m 47s
build (alpine/3.19/8.2/Dockerfile, spryker/php:latest, spryker/php:8.2, spryker/php:8.2-alpine3.1...	52m 37s
build (alpine/3.20/8.1/Dockerfile, spryker/php:8.1-alpine3.20, linux/amd64, linux/arm64)	3m 51s
build (alpine/3.20/8.2/Dockerfile, spryker/php:8.2-alpine3.20, linux/amd64, linux/arm64)	3m 50s
build (debian/bullseye/8.0/Dockerfile, spryker/php:8.0-debian, linux/amd64, linux/arm64)	32m 20s
build (debian/bullseye/8.1/Dockerfile, spryker/php:8.1-debian, linux/amd64, linux/arm64)	36m 35s
build (debian/bullseye/8.2/Dockerfile, spryker/php:8.2-debian, linux/amd64, linux/arm64)	38m 6s
	6h 18m 23s

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