Remove pkg/errors from dependencies

[yurishkuro]

Resolves #2061.

[codecov]

Codecov Report

Merging #2073 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2073      +/-   ##
==========================================
- Coverage   96.38%   96.36%   -0.02%     
==========================================
  Files         214      214              
  Lines       10529    10529              
==========================================
- Hits        10148    10146       -2     
- Misses        324      326       +2     
  Partials       57       57

Impacted Files	Coverage Δ
cmd/query/app/server.go	91.78% <0%> (-2.74%)	⬇️
plugin/storage/badger/spanstore/reader.go	96.79% <0%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5ed586c...e2197c3. Read the comment docs.