Fix build info parsing.

[AlekSi]

It was changed at
golang/go@931d80e

[codecov]

Codecov Report

Merging #205 (ac6091b) into main (b561c8d) will not change coverage.
The diff coverage is 33.33%.

@@           Coverage Diff           @@
##             main     #205   +/-   ##
=======================================
  Coverage   48.08%   48.08%           
=======================================
  Files          91       91           
  Lines        4500     4500           
=======================================
  Hits         2164     2164           
  Misses       1955     1955           
  Partials      381      381           

Impacted Files	Coverage Δ
internal/util/version/version.go	35.29% <33.33%> (ø)

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