Bump spring-boot.version from 2.3.0.RELEASE to 2.3.1.RELEASE (#3332)

Bumps `spring-boot.version` from 2.3.0.RELEASE to 2.3.1.RELEASE.

Updates `spring-boot-dependencies` from 2.3.0.RELEASE to 2.3.1.RELEASE
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.3.0.RELEASE...v2.3.1.RELEASE)

Updates `spring-boot-maven-plugin` from 2.3.0.RELEASE to 2.3.1.RELEASE
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.3.0.RELEASE...v2.3.1.RELEASE)
Signed-off-by: Ndependabot-preview[bot] <support@dependabot.com>
Co-authored-by: Ndependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

pom.xml

@@ -221,7 +221,7 @@
     <maven-site-plugin.version>3.8.2</maven-site-plugin.version>
     <maven-source-plugin.version>3.2.1</maven-source-plugin.version>
     <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
-    <spring-boot.version>2.3.0.RELEASE</spring-boot.version>
+    <spring-boot.version>2.3.1.RELEASE</spring-boot.version>
     <versions-maven-plugin.version>2.7</versions-maven-plugin.version>
 
     <!-- configuration properties for tests -->