Add a 6.1.4 section to the release notes

Author: Numpsy

RELEASE_NOTES.md

@@ -1,4 +1,7 @@
 # Release Notes
+## 6.1.4 - 2025-01-09
+* ENHANCEMENT: In Fake.Dotnet.Cli, parse global.json using System.Text.Json instead of Newtonsoft.Json, thanks @Numpsy - https://github.com/fsprojects/FAKE/pull/2839
+
 ## 6.1.3 - 2024-09-26
 * ENHANCEMENT: SdkAssemblyResolver. Support using the latest installed SDK.