chore(git): bump go-git-v6 and don't fetch git tags

[erka]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.33%. Comparing base (33e7ddb) to head (088c390).
⚠️ Report is 1 commits behind head on v2.

Additional details and impacted files

@@            Coverage Diff             @@
##               v2    #5105      +/-   ##
==========================================
- Coverage   60.37%   60.33%   -0.04%     
==========================================
  Files         137      137              
  Lines       13423    13425       +2     
==========================================
- Hits         8104     8100       -4     
- Misses       4634     4639       +5     
- Partials      685      686       +1     

Flag	Coverage Δ
integrationtests	34.67% <66.66%> (-0.16%)	⬇️
unittests	51.43% <100.00%> (+<0.01%)	⬆️

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[dosubot]

Documentation Updates

1 document(s) were updated by changes in this PR:

flipt

• Flipt SCM Providers and Git Integration (View Changes)

^{How did I do? Any feedback?}  

[markphelps]

nice one