Typo fix Update CHANGELOG.md (#2463)

# Fix Typo in CHANGELOG.md

This pull request addresses a minor typo in the `CHANGELOG.md` file.
Specifically:
- Corrected `freqency` to `frequency`.

No other changes were made, ensuring the content remains consistent and
readable.

---

### Changes:
```diff
- fix: reduce sync freqency to help reduce hub load
+ fix: reduce sync frequency to help reduce hub load


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## PR-Codex overview
This PR focuses on updates to the `CHANGELOG.md` file for version `1.9.5`, specifically addressing fixes related to the handling of gossip messages and synchronization frequency.

### Detailed summary
- Removed score penalty for duplicate gossip messages.
- Corrected the spelling of "frequency" in the note about reducing sync frequency to help reduce hub load.

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apps/hubble/CHANGELOG.md

@@ -584,7 +584,7 @@
 ### Patch Changes
 
 - 577d698d: fix: Remove score penalty for duplicate gossip messages
-- 57ce2c66: fix: reduce sync freqency to help reduce hub load
+- 57ce2c66: fix: reduce sync frequency to help reduce hub load
 
 ## 1.9.5