fix: increase channel size and pending cert interval

[gruberb]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Additions and Changes

Please explain in detail, if applicable, which changes you performed in the PR and link them to issues. (If not applicable you can remove this whole section)

Bug fix (non-breaking change which fixes an issue)

New feature (non-breaking change which adds functionality)

Breaking changes

Please explain in detail which changes are breaking changes in the PR. (If not applicable you can remove this whole section)

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 71.37%. Comparing base (3b58159) to head (d685d4a).

Files	Patch %	Lines
crates/topos-sequencer-subnet-runtime/src/proxy.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #491      +/-   ##
==========================================
- Coverage   71.99%   71.37%   -0.62%     
==========================================
  Files         219      219              
  Lines       12829    12830       +1     
==========================================
- Hits         9236     9158      -78     
- Misses       3593     3672      +79     

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