documentation: Bump version

docs/changelog.md

@@ -2,6 +2,11 @@
 icon: material/alert-decagram
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+#### 1.12.0-alpha.2
+
+* Update quic-go to v0.49.0
+* Fixes and improvements
+
 #### 1.12.0-alpha.1
 
 * Refactor DNS servers **1**