Update Jackson and add Snyk ignore file (#60)

Author: ksclarke

.snyk

@@ -0,0 +1,5 @@
+ignore:
+  'CVE-2022-42889':
+    - '*':
+      reason: Not in our dependency tree
+      expires: 2024-02-01

pom.xml

@@ -74,7 +74,7 @@
     <fluency.core.version>2.6.4</fluency.core.version>
     <fluency.fluentd.version>2.6.4</fluency.fluentd.version>
     <msgpack.core.version>0.9.1</msgpack.core.version>
-    <jackson.databind.version>2.13.4.2</jackson.databind.version>
+    <jackson.databind.version>2.16.0</jackson.databind.version>
     <jackson.dataformat.msgpack.version>0.9.1</jackson.dataformat.msgpack.version>
     <logback.more.appenders.version>1.8.7</logback.more.appenders.version>