deps: update dependency com.fasterxml.jackson:jackson-bom to v2.12.4 (#398)

Author: renovate-bot

java-shared-dependencies/pom.xml

@@ -75,7 +75,7 @@
     <opencensus.version>0.28.0</opencensus.version>
     <findbugs.version>3.0.2</findbugs.version>
     <errorprone.version>2.7.1</errorprone.version>
-    <jackson.version>2.12.3</jackson.version>
+    <jackson.version>2.12.4</jackson.version>
     <codec.version>1.15</codec.version>
     <httpcomponents.httpcore.version>4.4.14</httpcomponents.httpcore.version>
     <httpcomponents.httpclient.version>4.5.13</httpcomponents.httpclient.version>