GHC-8.8 branch has Cabal-3.0.0.0-rc3, not Cabal-3.0.0.0
% git log Cabal-v3.0.0.0-rc3..Cabal-v3.0.0.0 --oneline
b0e52fa17 (tag: Cabal-v3.0.0.0, origin/3.0) Update AUTHORS. [ci skip]
e91d2ec50 Changelog update. [ci skip]
af7de53f3 Merge pull request #5451 from nh2/issue-4925-pass-ld-options-to-ghc
1b324a1df (3.0) Merge pull request #6174 from haskell/backports-ignore-msg-spdx
d7ff6d1b5 (origin/backports-ignore-msg-spdx, backports-ignore-msg-spdx) parser: Clearly state that invalid fields are ignored
f1911a662 Update to SPDX License List 3.6 2019-07-10
0a69501ca Changelog update.
3ede184e7 Merge pull request #6161 from haskell/gb/parse-config-multiline