Update CHANGELOG: put changes into the unreleased section

Author: olksdr

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+**Features**:
+
+- Make Redis connection pool configurable. ([#1413](https://github.com/getsentry/relay/pull/1413))
+
 ## 22.8.0
 
 **Features**:
@@ -9,7 +15,6 @@
 - Filter events in external Relays, before extracting metrics. ([#1379](https://github.com/getsentry/relay/pull/1379))
 - Add `privatekey` and `private_key` as secret key name to datascrubbers. ([#1376](https://github.com/getsentry/relay/pull/1376))
 - Explain why we responded with 429. ([#1389](https://github.com/getsentry/relay/pull/1389))
-- Make Redis connection pool configurable. ([#1413](https://github.com/getsentry/relay/pull/1413))
 
 **Bug Fixes**: