Bump jackson.version from 2.9.9 to 2.12.1

Bumps `jackson.version` from 2.9.9 to 2.12.1.

Updates `jackson-core` from 2.9.9 to 2.12.1
- [Release notes](https://github.com/FasterXML/jackson-core/releases)
- [Commits](FasterXML/jackson-core@jackson-core-2.9.9...jackson-core-2.12.1)

Updates `jackson-databind` from 2.9.9 to 2.12.1
- [Release notes](https://github.com/FasterXML/jackson/releases)
- [Commits](https://github.com/FasterXML/jackson/commits)

Updates `jackson-annotations` from 2.9.9 to 2.12.1
- [Release notes](https://github.com/FasterXML/jackson/releases)
- [Commits](https://github.com/FasterXML/jackson/commits)

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

Author: dependabot[bot]

pom.xml

@@ -38,7 +38,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <httpcomponents.version>4.5.2</httpcomponents.version>
         <guava.version>19.0</guava.version>
-        <jackson.version>2.9.9</jackson.version>
+        <jackson.version>2.12.1</jackson.version>
         <junit.version>4.12</junit.version>
         <mockito.version>1.10.19</mockito.version>
     </properties>