Use GHC 8.8 as the minimum bootstrap compiler version
This patch makes GHC 8.8 the minimum bootstrap compiler across all
Docker images in preparation for the same requirement being imposed
on GHC. In most cases, I was able to use 8.8.3. The exception is
x86_64-linux-deb10
, where the only 8.8 bindist I could find was
8.8.1.
Edited by Ryan Scott