Bump jackson-core from 2.11.3 to 2.12.3

Bumps [jackson-core](https://github.com/FasterXML/jackson-core) from 2.11.3 to 2.12.3.
- [Release notes](https://github.com/FasterXML/jackson-core/releases)
- [Commits](FasterXML/jackson-core@jackson-core-2.11.3...jackson-core-2.12.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

pom.xml

@@ -26,7 +26,7 @@
 		<jena.version>3.15.0</jena.version>
 		<!-- BEGIN should correspond to https://repo1.maven.org/maven2/org/apache/jena/jena/3.9.0/jena-3.9.0.pom -->
 		<ver.jsonldjava>0.13.0</ver.jsonldjava>
-		<ver.jackson>2.11.1</ver.jackson>
+		<ver.jackson>2.12.3</ver.jackson>
 		<!-- END -->
 	</properties>