Bump spring.version in /Chapter-01-Spring-Introduction-and-Patterns

Bumps `spring.version` from 5.0.2.RELEASE to 5.2.1.RELEASE.

Updates `spring-core` from 5.0.2.RELEASE to 5.2.1.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.0.2.RELEASE...v5.2.1.RELEASE)

Updates `spring-context` from 5.0.2.RELEASE to 5.2.1.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.0.2.RELEASE...v5.2.1.RELEASE)

Updates `spring-beans` from 5.0.2.RELEASE to 5.2.1.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.0.2.RELEASE...v5.2.1.RELEASE)

Updates `spring-aop` from 5.0.2.RELEASE to 5.2.1.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.0.2.RELEASE...v5.2.1.RELEASE)

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

Author: dependabot[bot]

Chapter-01-Spring-Introduction-and-Patterns/pom.xml

@@ -5,7 +5,7 @@
   <version>0.0.1-SNAPSHOT</version>
 
   <properties>
-  	<spring.version>5.0.2.RELEASE</spring.version>
+  	<spring.version>5.2.1.RELEASE</spring.version>
   	<aspectj.version>1.8.9</aspectj.version>
   </properties>