Update CHANGELOG.md

CHANGELOG.md

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+# 5.4.0 (unreleased)
+
+### Minor
+
+* **OAuth**: Allow oauth email attribute name to be configurable [#12986](https://github.com/grafana/grafana/issues/12986), thx [@bobmshannon](https://github.com/bobmshannon)
+
 # 5.3.0 (unreleased)
 
 ### Minor