Bump spring-framework-bom from 5.2.7.RELEASE to 5.2.8.RELEASE (#65)

Bumps [spring-framework-bom](https://github.com/spring-projects/spring-framework) from 5.2.7.RELEASE to 5.2.8.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.2.7.RELEASE...v5.2.8.RELEASE)

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Author: dependabot[bot]

pom.xml

@@ -37,7 +37,7 @@
     </licenses>
 
     <properties>
-        <spring.version>5.2.7.RELEASE</spring.version>
+        <spring.version>5.2.8.RELEASE</spring.version>
         <spring-data.version>2.3.1.RELEASE</spring-data.version>
 
         <hibernate-validator.version>6.1.5.Final</hibernate-validator.version>