Bump spring-core from 4.2.9.RELEASE to 4.3.19.RELEASE

Bumps [spring-core](https://github.com/spring-projects/spring-framework) from 4.2.9.RELEASE to 4.3.19.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v4.2.9.RELEASE...v4.3.19.RELEASE)
Signed-off-by: Ndependabot[bot] <support@github.com>

pom.xml

@@ -13,7 +13,7 @@
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-core</artifactId>
-      <version>4.2.9.RELEASE</version>
+      <version>4.3.19.RELEASE</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>