Bump jacksonjr.version from 2.11.2 to 2.12.3

Bumps `jacksonjr.version` from 2.11.2 to 2.12.3.

Updates `jackson-jr-objects` from 2.11.2 to 2.12.3
- [Release notes](https://github.com/FasterXML/jackson-jr/releases)
- [Commits](FasterXML/jackson-jr@jackson-jr-parent-2.11.2...jackson-jr-parent-2.12.3)

Updates `jackson-jr-stree` from 2.11.2 to 2.12.3
- [Release notes](https://github.com/FasterXML/jackson-jr/releases)
- [Commits](FasterXML/jackson-jr@jackson-jr-parent-2.11.2...jackson-jr-parent-2.12.3)

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -88,7 +88,7 @@
         <awsjavasdk.previous.version>2.16.60</awsjavasdk.previous.version>
         <jackson.version>2.12.3</jackson.version>
         <jackson.databind.version>2.12.1</jackson.databind.version>
-        <jacksonjr.version>2.11.2</jacksonjr.version>
+        <jacksonjr.version>2.12.3</jacksonjr.version>
         <eventstream.version>1.0.1</eventstream.version>
         <ion.java.version>1.2.0</ion.java.version>
         <commons.lang.version>3.4</commons.lang.version>