Bump spring from 4.0.5.RELEASE to 4.3.21.RELEASE

Bumps [spring](https://github.com/spring-projects/spring-framework) from 4.0.5.RELEASE to 4.3.21.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.0.5.RELEASE...v4.3.21.RELEASE)

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

pom.xml

@@ -144,13 +144,13 @@ This program is made available under the terms of the MIT License.
             <dependency>
                 <groupId>org.springframework</groupId>
                 <artifactId>spring-test</artifactId>
-                <version>4.0.5.RELEASE</version>
+                <version>4.3.21.RELEASE</version>
                 <scope>test</scope>
             </dependency>
             <dependency>
                 <groupId>org.springframework</groupId>
                 <artifactId>spring-core</artifactId>
-                <version>4.0.5.RELEASE</version>
+                <version>4.3.21.RELEASE</version>
                 <scope>test</scope>
             </dependency>
             <dependency>