Upgrade grpc lib to v1.34.0

[alpe]

Resolves #339

[codecov]

Codecov Report

Merging #340 (7e59926) into master (9e2a97e) will decrease coverage by 1.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #340      +/-   ##
==========================================
- Coverage   70.80%   69.73%   -1.08%     
==========================================
  Files          28       28              
  Lines        2374     2415      +41     
==========================================
+ Hits         1681     1684       +3     
- Misses        577      613      +36     
- Partials      116      118       +2     

Impacted Files	Coverage Δ
x/wasm/internal/types/types.go	23.52% <0.00%> (-4.25%)	⬇️
x/wasm/internal/types/codec.go	44.00% <0.00%> (-1.17%)	⬇️
x/wasm/internal/keeper/keeper.go	89.97% <0.00%> (-0.59%)	⬇️

[ethanfrey]

ack