Alcohol is OK in a hot car for a short time.
However if you leave alcohol in the hot car too long it can dilute the alcohol content in the alcohol and then the alcohol may not be as good.
Leaving alcohol in a hot car for a few hours should do no harm to the alcohol but you should never leave the alcohol in the hot car longer than a few hours.
I've left alcohol in my hot car before for a few days and the alcohol changed in taste even though I refrigerated the alcohol to cool it down.
The alcohol never tasted the same but was still okay to drink.
So if possible remove the alcohol and store it in a cool place until you're ready to consume it.