Bump jackson-databind from 2.7.1 to 2.12.6.1

Bumps [jackson-databind](https://github.com/FasterXML/jackson) from 2.7.1 to 2.12.6.1.
- [Release notes](https://github.com/FasterXML/jackson/releases)
- [Commits](https://github.com/FasterXML/jackson/commits)

---
updated-dependencies:
- dependency-name: com.fasterxml.jackson.core:jackson-databind
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 6c90640..5f9b2f5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -58,7 +58,7 @@
         <jsonrpc_version>1.2.0</jsonrpc_version>
         <jetty_version>9.3.7.v20160115</jetty_version>
         <mortbay_jetty_version>6.1.26</mortbay_jetty_version>
-        <jackson.version>2.7.1</jackson.version>
+        <jackson.version>2.12.6.1</jackson.version>
         <maven.compiler.source>1.7</maven.compiler.source>
         <maven.compiler.target>1.7</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>