Enable service config as default and remove WithBalancer to bump grpc version to 1.40

[clannadxr]

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[codecov]

Codecov Report

Merging #286 (1c06688) into master (e7b08c6) will decrease coverage by 0.10%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #286      +/-   ##
==========================================
- Coverage   60.27%   60.17%   -0.11%     
==========================================
  Files          77       77              
  Lines        2754     2757       +3     
==========================================
- Hits         1660     1659       -1     
- Misses        927      930       +3     
- Partials      167      168       +1     

Flag	Coverage Δ
unittests	60.17% <66.66%> (-0.11%)	⬇️

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Impacted Files	Coverage Δ
client/egrpc/component.go	72.97% <60.00%> (-9.38%)	⬇️
client/egrpc/config.go	100.00% <100.00%> (ø)

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