fix: upgrade io.reactivex.rxjava3:rxjava from 3.1.8 to 3.1.9

Snyk has created this PR to upgrade io.reactivex.rxjava3:rxjava from 3.1.8 to 3.1.9.

See this package in maven:
io.reactivex.rxjava3:rxjava

See this project in Snyk:
https://app.snyk.io/org/contentstack-devex/project/d4e249e0-1e7c-480b-9181-5e419e6d80c3?utm_source=github&utm_medium=referral&page=upgrade-pr

pom.xml

@@ -88,7 +88,7 @@
         <maven-source-plugin.version>2.2.1</maven-source-plugin.version>
         <maven-javadoc-plugin.version>3.0.0</maven-javadoc-plugin.version>
         <dotenv-source.version>5.2.2</dotenv-source.version>
-        <rxjava-source.version>3.1.8</rxjava-source.version>
+        <rxjava-source.version>3.1.9</rxjava-source.version>
         <retrofit-source.version>2.10.0</retrofit-source.version>
         <converter-gson-version>2.10.0</converter-gson-version>
         <okhttp.version>4.12.0</okhttp.version>