Flake: HedgedObjectReadSourceTest.HedgeOpenFailureReleasesSlot

[scotthart]

https://storage.googleapis.com/cloud-cpp-community-publiclogs/logs/google-cloud-cpp/16412/acd756cac86341327010db887393348eaabb9831/ubuntu-22.04-cmake-oldest-deps-__default__/log-412127b2-3ff0-4b33-a2dc-363f228a0a1b.txt

Step #2 - "build.sh": [ RUN      ] HedgedObjectReadSourceTest.HedgeOpenFailureReleasesSlot
Step #2 - "build.sh": 
Step #2 - "build.sh": GMOCK WARNING:
Step #2 - "build.sh": Uninteresting mock function call - returning default value.
Step #2 - "build.sh":     Function call: Close()
Step #2 - "build.sh":           Returns: 104-byte object <E0-24 00-7C 21-7F 00-00 56-00 00-00 00-00 00-00 56-00 00-00 00-00 00-00 30-B6 DA-32 FF-7F 00-00 5E-12 97-8B 21-7F 00-00 70-E2 0C-8B 21-7F 00-00 78-E4 0C-8B 21-7F 00-00 C0-DB 0C-8B 21-7F 00-00 CD-1D 79-CA 76-55 00-00 70-E2 0C-8B 21-7F 00-00 30-E2 0C-8B 21-7F 00-00 60-E4 0C-8B 21-7F 00-00 00-F6 0C-8B 21-7F 00-00>
Step #2 - "build.sh": NOTE: You can safely ignore the above warning unless this call should not happen.  Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call.  See https://github.com/google/googletest/blob/main/docs/gmock_cook_book.md#knowing-when-to-expect-useoncall for details.
Step #2 - "build.sh": /workspace/google/cloud/storage/internal/hedged_object_read_source_test.cc:316: Failure
Step #2 - "build.sh": Value of: result
Step #2 - "build.sh": Expected: code is equal to OK and message is anything
Step #2 - "build.sh":   Actual: 304-byte object <90-78 6E-CB 76-55 00-00 00-00 00-00 00-00 00-00 A8-7E 8B-CA 76-55 00-00 28-C1 DA-32 FF-7F 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 ... 30-10 00-7C 21-7F 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00 00-00>, whose status is UNAVAILABLE: open failed, with a code that isn't equal to OK, but a message that is anything
Step #2 - "build.sh": 
Step #2 - "build.sh": [  FAILED  ] HedgedObjectReadSourceTest.HedgeOpenFailureReleasesSlot (30 ms)