Upgrade dependencies.

[jmjoy]

1. Upgrade tonic to 0.8.
2. OnceCellReporter is unnecessary, just replace with OnceCell.

The new version prost now require protoc installed (don't auto build protoc from sources if not exists), so add protoc in CI.
Refer:https://github.com/tokio-rs/prost/releases/tag/v0.11.0

[codecov-commenter]

Codecov Report

Merging #42 (8cface4) into master (b8a4a18) will increase coverage by 0.17%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
+ Coverage   27.40%   27.57%   +0.17%     
==========================================
  Files          17       16       -1     
  Lines         478      475       -3     
==========================================
  Hits          131      131              
+ Misses        347      344       -3     

Impacted Files	Coverage Δ
src/reporter/mod.rs	0.00% <0.00%> (ø)

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