Update release notes wrt FasterXML#3082

(cherry picked from commit 027e795)

Author: cowtowncoder

release-notes/CREDITS-2.x

@@ -1313,3 +1313,7 @@ Miguel G (Migwel@github)
 Jelle Voost (jellevoost@github)
   * Reported #3038: Two cases of incorrect error reporting about DeserializationFeature
    (2.12.2)
+
+David Hoffman (dhofftgt@github)
+  * Contributed #3082: Dont track unknown props in buffer if `ignoreAllUnknown` is true
+   (2.12.2)

release-notes/VERSION-2.x

@@ -7,7 +7,9 @@ Project: jackson-databind
 2.12.3 (not yet released)
 
 - Fix for [modules-java8#207]: prevent fail on secondary Java 8 date/time types
-
+#3082: Dont track unknown props in buffer if `ignoreAllUnknown` is true
+ (contributed by David H)
+ 
 2.12.2 (03-Mar-2021)
 
 #754: EXTERNAL_PROPERTY does not work well with `@JsonCreator` and