Commit 93d2060d authored by Ryan Scott's avatar Ryan Scott

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.
parent 408eff66
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