Update dependency com.fasterxml.jackson.core:jackson-core to v2.9.9 (#653)

Author: renovate-bot

pom.xml

@@ -546,7 +546,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.jsr305.version>3.0.2</project.jsr305.version>
     <project.gson.version>2.1</project.gson.version>
-    <project.jackson-core2.version>2.9.6</project.jackson-core2.version>
+    <project.jackson-core2.version>2.9.9</project.jackson-core2.version>
     <project.protobuf-java.version>3.6.1</project.protobuf-java.version>
     <project.guava.version>26.0-android</project.guava.version>
     <project.xpp3.version>1.1.4c</project.xpp3.version>