Added GScan to Renovate ignore list
Added GScan to Renovate ignore list

refs https://github.com/TryGhost/Ghost/commit/0d2c9900130e88b3c01e37d1cdc1814fb0324e49

- we've had to temporarily hold back a GScan update whilst we think
  about theme loading in Ghost
- this commit adds GScan to the Renovate ignore list so it won't
  automatically bump the package

janvt/Ghost,TryGhost/Ghost,TryGhost/Ghost,ErisDS/Ghost,ErisDS/Ghost,TryGhost/Ghost,e10/Ghost,ErisDS/Ghost,e10/Ghost,janvt/Ghost