Update dependencies: prost to 0.8 and tonic to 0.5 #818
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Which issue does this PR close?
Closes #817
Rationale for this change
Examples are failing as they use an incompatible version of tonic/prost that came in with arrow 5.1.0 (apache/arrow-rs#560) which leads to failures on CI PRs such as https://github.com/apache/arrow-datafusion/pull/808/checks?check_run_id=3223418729
What changes are included in this PR?
Update dependencies: prost to 0.8 and tonic to 0.5
Are there any user-facing changes?
New version of dependent libraries