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Tests started failing unexpectedly: https://github.com/Dana-Farber-AIOS/pathml/runs/6749244149?check_suite_focus=true
The problem seems to be an error raised by the protobuf package. Checking the logs shows that the version of protobuf in the failing test (4.21.1) is different from the one in the last passing test (3.20.1). Other people have reported similar issue (protocolbuffers/protobuf#10051). This PR pins protobuf version to 3.20.1 to try to fix the test suite