Bump jackson.version from 2.5.4 to 2.12.1

Bumps `jackson.version` from 2.5.4 to 2.12.1.

Updates `jackson-annotations` from 2.5.4 to 2.12.1
- [Release notes](https://github.com/FasterXML/jackson/releases)
- [Commits](https://github.com/FasterXML/jackson/commits)

Updates `jackson-databind` from 2.5.4 to 2.12.1
- [Release notes](https://github.com/FasterXML/jackson/releases)
- [Commits](https://github.com/FasterXML/jackson/commits)

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

Author: dependabot[bot]

pom.xml

@@ -80,7 +80,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <slf4j.version>1.7.7</slf4j.version>
     <teavm.version>0.7.0-dev-1169</teavm.version>
-    <jackson.version>2.5.4</jackson.version>
+    <jackson.version>2.12.1</jackson.version>
     <antlr.version>4.6</antlr.version>
     <selenium.version>2.51.0</selenium.version>
     <sonatypeOssDistMgmtSnapshotsUrl>https://oss.sonatype.org/content/repositories/snapshots/</sonatypeOssDistMgmtSnapshotsUrl>