Travis cache update fails on windows machines

Sometimes windows machine tasks fails on the cache update stage with the “No output has been received in the last 10m0s” error like following:

store build cache
Running casher in bash
changes detected (content changed, file is created, or file is deleted):
C:\Users	ravis\.carginchanges detected, packing new archive
No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

https://travis-ci.com/exonum/exonum-merkledb/jobs/176709836

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