Update PowerSystemsTestData org reference from NREL-Sienna to Sienna-Platform#117

Copilot wants to merge 2 commits into

masterSienna-Platform/PowerSystemsTestData:masterfrom

copilot/update-nrel-sienna-referencesSienna-Platform/PowerSystemsTestData:copilot/update-nrel-sienna-referencesCopy head branch name to clipboard