Not the PA constitution. If they haven't amended it, and they haven't, the legislature appoints the electors...and in fact is preparing to do so.
It's not that simple.
https://www.nytimes.com/article/electors-vote.htmlThe Electoral Count Act, a 19th-century law, sets up the mechanism for how that takes place. It directs governors to certify both the election results and a slate of presidential electors to represent the will of the people. In general practice, governors certify electors chosen by the party of the presidential candidate who won their state.
The Electoral Count Act also says that in the event of “failed elections,” in which voters have not made a choice for president, state legislatures are empowered to step in and appoint electors. The 1887 law is ambiguous about what constitutes a “failed” election. But the law does contain a deadline for states to certify elections: the “safe harbor” date, which this year is Dec. 8. Electors chosen before that date cannot be challenged by Congress.