You'll be perfectly fine.
Foliar sprays are silly, if they are supposed to be absorbed by the plant's leaves... through what? their stomatas? That's for transpiration, not aspiration, if i got the ters right, lol. Roots absorb things, so as long as you don't put that 8 pH on the roots, you are good to go. I'm sure some extreme contexts could be detrimental, but not at 8 or even 8.5. My tap is city wayer and is 8.4.
You can always ph-down if you want. It's not costly or anything. 5-6mL per gallon of distilled white vineager 5% would do it, i bet.