Merge pull request #10976 from haskell/ulysses4ever-patch-3

test suite: mark DedupUsingConfigFromSimple as flaky

cabal-testsuite/PackageTests/ProjectImport/DedupUsingConfigFromSimple/cabal.test.hs

 import Test.Cabal.Prelude
 
-main = cabalTest . recordMode RecordMarked $ do
+main = cabalTest . flakyIfCI 10975 . recordMode RecordMarked $ do
   let log = recordHeader . pure
 
   out <- fails $ cabal' "v2-build" [ "all", "--dry-run" ]