Increase MAX_PGF_ACTIONS

[brentstone]

Describe your changes

Increase MAX_PGF_ACTIONS from 20 to 1000. This will be helpful for the donor drop idea.

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
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 74.45%. Comparing base (0512963) to head (9f2cfb6).
Report is 53 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/governance/src/vp/mod.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4209      +/-   ##
==========================================
- Coverage   74.47%   74.45%   -0.02%     
==========================================
  Files         342      342              
  Lines      107777   107778       +1     
==========================================
- Hits        80263    80243      -20     
- Misses      27514    27535      +21     

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