Upgrade default PHP to 8.3 match Acquia's default

[rubenvarela]

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[reynoldsalec]

@pirog normally I'm loathe to update defaults but in this case it seems like a good idea...you cool with this?

[pirog]

I think in this case its probably fine @reynoldsalec. plus you and @rubenvarela have a better sense of what makes sense on acquia now vs me ;)