darwin-3 fails nearly all jobs

See, for instance, https://gitlab.haskell.org/ghc/ghc/-/jobs/1681954.

Fetching perf notes...
git fetch -f https://gitlab.haskell.org/ghc/ghc-performance-notes.git refs/notes/perf:refs/notes/perf
error: unable to rewind rpc post data - try increasing http.postBuffer
error: RPC failed; curl 65 HTTP/2 stream 31 was reset
fatal: expected 'acknowledgments'

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