build: Bump RC to rc2
build: Bump RC to rc2

Tree-SHA512: 2e9db22da514b0ef4456f46524762420730cdd3c160a4012ca9d736d18d01abd2403b0ce800743b1f92212937436fe849b1c1b07bed0e3ad9f61165be55b7958

qtumproject/qtum,qtumproject/qtum,qtumproject/qtum,qtumproject/qtum,qtumproject/qtum,qtumproject/qtum,qtumproject/qtum