Update ghcr.io/wyrihaximusnet/php Docker tag to v8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/wyrihaximusnet/php	final	major	7.4-nts-alpine-root -> 8.3-nts-alpine-root
ghcr.io/wyrihaximusnet/php	stage	major	7.4-nts-alpine-dev-root -> 8.3-nts-alpine-dev-root

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