aarch64-linux-deb12-validate+llvm fails consistently in recent nightly pipelines
`nightly-aarch64-linux-deb12-validate+llvm` has been consistently failing recently. The last one that passes is https://gitlab.haskell.org/ghc/ghc/-/jobs/2010455, the first failure is https://gitlab.haskell.org/ghc/ghc/-/jobs/2011690. It's blocking LLVM-related patches like !13369, maybe we should simply bump `jspace` timeout for LLVM jobs?
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