*Filters > Colour > Color shift*, and set the shift to 60°. Note that this is an SVG filter.

[![enter image description here][1]][1]

Or if you want to physically change the colours without using a filter, there's also *Extensions > Colour > HSL Adjust*. The Hue values are different from the Colour Shift filter and go from -360 to +360, so use a value of 30 instead of 60, but you may also have to tweak the lightness too.

[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/xVFtb.gif
  [2]: https://i.sstatic.net/3jU1y.gif