chore: update cometbft to v0.38.21 for v36

[morde08]

Description

• update cometbft to https://github.com/cometbft/cometbft/releases/tag/v0.38.21 for security patch

How Has This Been Tested?

• Tested CCTX in localnet
• Tested in development environment
• Go unit tests
• Go integration tests
• Tested via GitHub Actions

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Note

Dependency update (security patch)

• Bumps cometbft from v0.38.19 to v0.38.21 in go.mod
• Synchronizes go.sum checksums accordingly

No application code changes included.

^{Written by Cursor Bugbot for commit ce5c220. Configure here.}

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