fix: upgrade com.google.code.gson:gson from 2.8.9 to 2.9.0 (#1589)

Snyk has created this PR to upgrade com.google.code.gson:gson from 2.8.9 to 2.9.0.

See this package in Maven Repository:
https://mvnrepository.com/artifact/com.google.code.gson/gson/

See this project in Snyk:
https://app.snyk.io/org/openfeign/project/449cbbe1-85f2-4403-9361-132b4666fee7?utm_source=github&utm_medium=referral&page=upgrade-pr

pom.xml

@@ -77,7 +77,7 @@
     <okhttp3.version>4.9.2</okhttp3.version>
     <guava.version>30.1.1-jre</guava.version>
     <googlehttpclient.version>1.40.1</googlehttpclient.version>
-    <gson.version>2.8.9</gson.version>
+    <gson.version>2.9.0</gson.version>
     <slf4j.version>1.7.36</slf4j.version>
     <bouncy.version>1.70</bouncy.version>
     <json.version>20210307</json.version>