Resolve CI failure with longer MaxConnectionAge

[krapie]

What this PR does / why we need it:

Resolve CI failure with longer MaxConnectionAge.

This is to resolve intermittent CI failure, with the assumption that the RPC server's short MaxConnectionAge on testing is causing CI failure.

Because this solution is based on an assumption, we need to see whether this change will resolve CI failure or not.

Which issue(s) this PR fixes:

Fixes #546

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Additional documentation:

Checklist:

• Added relevant tests or not required
• Didn't break anything

[codecov]

Codecov Report

Merging #556 (672d96c) into main (c081d24) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #556   +/-   ##
=======================================
  Coverage   50.43%   50.43%           
=======================================
  Files          67       67           
  Lines        6763     6763           
=======================================
  Hits         3411     3411           
  Misses       2923     2923           
  Partials      429      429           

[hackerwins]

Thanks for your contribution.