[spec] Upgrade var-op-test from bash 4 to bash 5
#8830
akinomyogaall-builds.yml
on: pull_request
cpp-tarball
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dev-setup-debian
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dummy
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dev-minimal
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interactive
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pea
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other-tests
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ovm-tarball
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cpp-coverage
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benchmarks
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cpp-small
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cpp-spec
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raw-vm
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app-tests
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bloaty
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benchmarks2
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wild
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maybe-merge-to-master
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