Bump spring.version from 5.0.2.RELEASE to 5.2.6.RELEASE

Bumps `spring.version` from 5.0.2.RELEASE to 5.2.6.RELEASE.

Updates `spring-aop` from 5.0.2.RELEASE to 5.2.6.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.0.2.RELEASE...v5.2.6.RELEASE)

Updates `spring-context` from 5.0.2.RELEASE to 5.2.6.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.0.2.RELEASE...v5.2.6.RELEASE)

Updates `spring-web` from 5.0.2.RELEASE to 5.2.6.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.0.2.RELEASE...v5.2.6.RELEASE)

Updates `spring-webmvc` from 5.0.2.RELEASE to 5.2.6.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.0.2.RELEASE...v5.2.6.RELEASE)

Updates `spring-test` from 5.0.2.RELEASE to 5.2.6.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.0.2.RELEASE...v5.2.6.RELEASE)

Updates `spring-tx` from 5.0.2.RELEASE to 5.2.6.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.0.2.RELEASE...v5.2.6.RELEASE)

Updates `spring-jdbc` from 5.0.2.RELEASE to 5.2.6.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.0.2.RELEASE...v5.2.6.RELEASE)
Signed-off-by: Ndependabot[bot] <support@github.com>

pom.xml

@@ -17,7 +17,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.compiler.source>1.8</maven.compiler.source>
     <maven.compiler.target>1.8</maven.compiler.target>
-    <spring.version>5.0.2.RELEASE</spring.version>
+    <spring.version>5.2.6.RELEASE</spring.version>
     <slf4j.version>1.6.6</slf4j.version>
     <log4j.version>1.2.12</log4j.version>
     <mysql.version>5.1.6</mysql.version>