Disable updating minimum Go version in go.mod

[at-wat]

Same as pion/renovate-config#2

[codecov]

Codecov Report

Base: 58.15% // Head: 58.15% // No change to project coverage 👍

Coverage data is based on head (246baed) compared to base (52cf6e7).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #448   +/-   ##
=======================================
  Coverage   58.15%   58.15%           
=======================================
  Files          62       62           
  Lines        3680     3680           
=======================================
  Hits         2140     2140           
  Misses       1413     1413           
  Partials      127      127           

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