Bump version to haddock 2.29.0 for GHC 9.6.3
So that @FinleyMcIlwaine's memory usage fixes can be included in 9.6.3
Also includes b96241ba
Edited by Zubin
So that @FinleyMcIlwaine's memory usage fixes can be included in 9.6.3
Also includes b96241ba