Change default proposal quorum

[brentstone]

Describe your changes

Closes #3683

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 61.16%. Comparing base (24eebc7) to head (d52f49a).
Report is 83 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/governance/src/utils.rs	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3703      +/-   ##
==========================================
- Coverage   61.17%   61.16%   -0.01%     
==========================================
  Files         315      315              
  Lines      103220   103223       +3     
==========================================
- Hits        63141    63135       -6     
- Misses      40079    40088       +9     

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