Update security protocol release notes (#4595)

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# Checklist
- [ ] Reviewed the
[contributing](https://github.com/stellar/stellar-core/blob/master/CONTRIBUTING.md#submitting-changes)
document
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- [ ] Ran `clang-format` v8.0.0 (via `make format` or the Visual Studio
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docs/software/security-protocol-release-notes.md

@@ -53,6 +53,10 @@ It then follows that:
 
 # List of releases
 
+## v22.0.0 (2024-11-06)
+
+* `Ledger` - protocol - Fixed an issue with read only TTL extensions not being charged for when initiated within a contract.
+
 ## v20.4.0 (2024-04-08)
 
 * `Overlay` - security - remote crash could be triggered due to race condition in error code processing from a third party library.