examples: update remaining uses of grpc.Dial to NewClient

[dfawley]

RELEASE NOTES: none

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.55%. Comparing base (adf976b) to head (3fddd54).
Report is 56 commits behind head on master.

❗ Current head 3fddd54 differs from pull request most recent head c2b8d81

Please upload reports for the commit c2b8d81 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7248      +/-   ##
==========================================
- Coverage   81.24%   80.55%   -0.69%     
==========================================
  Files         345      349       +4     
  Lines       33941    34027      +86     
==========================================
- Hits        27574    27410     -164     
- Misses       5202     5428     +226     
- Partials     1165     1189      +24     

see 35 files with indirect coverage changes