Upgrade git2go to v33

[lhchavez]

New version dropped! #minor

[codecov]

Codecov Report

Merging #12 (dd939ce) into main (81c647d) will increase coverage by 1.47%.
The diff coverage is 65.59%.

❗ Current head dd939ce differs from pull request most recent head 7ea9280. Consider uploading reports for the commit 7ea9280 to get more accurate results

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
+ Coverage   53.10%   54.57%   +1.47%     
==========================================
  Files           7        8       +1     
  Lines        2000     2131     +131     
==========================================
+ Hits         1062     1163     +101     
- Misses        730      744      +14     
- Partials      208      224      +16     

Impacted Files	Coverage Δ
protocol.go	62.98% <0.00%> (ø)
server.go	21.53% <ø> (ø)
commits.go	58.07% <40.00%> (+0.03%)	⬆️
browser.go	52.29% <48.14%> (-0.13%)	⬇️
keyedpool.go	78.12% <78.12%> (ø)
packfile.go	55.12% <100.00%> (ø)

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