Adds lock on calls to ComputeHash to handle concurrency

[miguelvaz78]

Fixes #6059

Summary

Added a new static object that will be used to lock execution across threads.
Both ComputeHash calls were wrapped inside a lock statement so no concurrent executions can be done from different threads. Because of this, the result of the hash function had to be assigned to a new variable that is then used outside of the lock code block.

[miguelvaz78]

@microsoft-github-policy-service agree

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[valadas]

Looks good to me, thanks!

[miguelvaz78]

Thanks guys!

[valadas]

Thank YOU