CI: Spurious allocation failures on Windows
@sheaf has observed spurious failures on Windows:
- https://gitlab.haskell.org/ghc/ghc/-/jobs/1614138#L8156
- https://gitlab.haskell.org/ghc/ghc/-/jobs/1614237#L5050
- https://gitlab.haskell.org/ghc/ghc/-/jobs/1614491#L8168
- https://gitlab.haskell.org/ghc/ghc/-/jobs/1614627#L8172
- https://gitlab.haskell.org/ghc/ghc/-/jobs/1604123
- https://gitlab.haskell.org/ghc/ghc/-/jobs/1604199
- https://gitlab.haskell.org/ghc/ghc/-/jobs/1603516
- https://gitlab.haskell.org/ghc/ghc/-/jobs/1603657
- https://gitlab.haskell.org/ghc/ghc/-/jobs/1604430
- https://gitlab.haskell.org/ghc/ghc/-/jobs/1604026
Originally reported as comments to #23655 (closed).