Bump json from 20201115 to 20210307 in /java-app-backend/BackendFunction

Bumps [json](https://github.com/douglascrockford/JSON-java) from 20201115 to 20210307.
- [Release notes](https://github.com/douglascrockford/JSON-java/releases)
- [Commits](https://github.com/douglascrockford/JSON-java/commits)

Signed-off-by: dependabot[bot] <support@github.com>

java-app-backend/BackendFunction/pom.xml

@@ -75,7 +75,7 @@
         <dependency>
             <groupId>org.json</groupId>
             <artifactId>json</artifactId>
-            <version>20201115</version>
+            <version>20210307</version>
         </dependency>
         <dependency>
             <groupId>software.amazon.awssdk</groupId>