fix: upgrade org.springframework:spring-context from 4.2.0.RELEASE to 4.3.30.RELEASE

Snyk has created this PR to upgrade org.springframework:spring-context from 4.2.0.RELEASE to 4.3.30.RELEASE.

See this package in Maven Repository:
https://mvnrepository.com/artifact/org.springframework/spring-context/

See this project in Snyk:
https://app.snyk.io/org/salesforce-oss/project/dd5e6e65-86e5-400b-8534-4ae694682dd8?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

contrib/pom.xml

@@ -64,7 +64,7 @@
         <slf4j.version>1.7.21</slf4j.version>
         <gson.version>2.7</gson.version> <!-- Same version as grpc-proto -->
         <mustache-java.version>0.9.4</mustache-java.version>
-        <spring.version>4.2.0.RELEASE</spring.version>
+        <spring.version>4.3.30.RELEASE</spring.version>
 
         <!-- Test Dependency Versions -->
         <junit.version>4.13.1</junit.version>