Update jackson version and add java 11

Author: muzahidul-opti

.github/workflows/java.yml

@@ -49,7 +49,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        jdk: [8, 9]
+        jdk: [8, 9, 11]
         optimizely_default_parser: [GSON_CONFIG_PARSER, JACKSON_CONFIG_PARSER, JSON_CONFIG_PARSER, JSON_SIMPLE_CONFIG_PARSER]
     steps:
       - name: checkout

gradle.properties

@@ -14,7 +14,7 @@ gsonVersion = 2.10.1
 guavaVersion = 22.0
 hamcrestVersion = 1.3
 # NOTE: jackson 2.14+ uses Java8 stream apis not supported in android
-jacksonVersion = 2.14.2
+jacksonVersion = 2.15.2
 jsonVersion = 20190722
 jsonSimpleVersion = 1.1.1
 logbackVersion = 1.2.3