fix: sanitize separators in expected path

Failed in 1h 4m
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460020 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 8s
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Ran in 1h 3m
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460020 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 7s
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Ran in 10s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460020 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 10s
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Ran in 10s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460020 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 9s
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Ran in 55m 23s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460020 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 10s
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Ran in 11s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460020 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 2s
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Ran in 10s
:windows: Windowscurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460020 -o bazelci.py && python.exe bazelci.py runner --task=windows
Waited 4s
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Ran in 5m 49s
Total Job Run Time: 2h 19m