test: upgrade grpc test fixture to 1.22.2

[kjin]

No description provided.

[codecov]

Codecov Report

Merging #1071 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1071      +/-   ##
==========================================
+ Coverage   94.87%   94.92%   +0.04%     
==========================================
  Files          96       96              
  Lines        6327     6386      +59     
  Branches      496      496              
==========================================
+ Hits         6003     6062      +59     
  Misses        166      166              
  Partials      158      158

Impacted Files	Coverage Δ
test/plugins/test-trace-grpc.ts	97.68% <ø> (ø)	⬆️
test/plugins/test-trace-http.ts	100% <0%> (ø)	⬆️
test/test-trace-writer.ts	98.46% <0%> (ø)	⬆️
test/plugins/test-trace-knex.ts	97.54% <0%> (+0.02%)	⬆️
test/test-config-priority.ts	96% <0%> (+0.08%)	⬆️
test/trace.ts	93.58% <0%> (+0.08%)	⬆️
test/test-trace-hapi-tails.ts	97.95% <0%> (+0.08%)	⬆️
test/plugins/test-cls-bluebird.ts	96.82% <0%> (+0.1%)	⬆️
test/test-trace-web-frameworks.ts	98.83% <0%> (+0.11%)	⬆️
test/test-grpc-async-handler.ts	97.18% <0%> (+0.16%)	⬆️
... and 4 more

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