fix: sanitize separators in expected path

Failed in 1h 12m
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460055 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 10s
·
Ran in 1h 11m
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460055 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 3s
·
Ran in 9s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460055 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 9s
·
Ran in 10s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460055 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 11s
·
Ran in 1h 6m
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460055 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 11s
·
Ran in 10s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460055 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 11s
·
Ran in 11s
:windows: Windowscurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736460055 -o bazelci.py && python.exe bazelci.py runner --task=windows
Waited 2s
·
Ran in 5m 22s
Total Job Run Time: 2h 36m