[close #509] update google-gson to 2.8.9 (#508) (#510)

* cherry pick #508 to release-3.1

Signed-off-by: ti-srebot <[email protected]>

* Update pom.xml

Co-authored-by: Liangliang Gu <[email protected]>

Author: ti-srebot

pom.xml

@@ -63,7 +63,7 @@
         <log4j.version>1.2.17</log4j.version>
         <slf4j.version>1.7.16</slf4j.version>
         <grpc.version>1.38.0</grpc.version>
-        <gson.version>2.8.5</gson.version>
+        <gson.version>2.8.9</gson.version>
         <powermock.version>1.6.6</powermock.version>
         <jackson.version>2.10.5</jackson.version>
         <jackson.databind.version>2.10.5.1</jackson.databind.version>