Bump spring.boot.version from 2.1.0.RELEASE to 2.3.1.RELEASE

Bumps `spring.boot.version` from 2.1.0.RELEASE to 2.3.1.RELEASE.

Updates `spring-boot` from 2.1.0.RELEASE to 2.3.1.RELEASE
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.1.0.RELEASE...v2.3.1.RELEASE)

Updates `spring-boot-autoconfigure` from 2.1.0.RELEASE to 2.3.1.RELEASE
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.1.0.RELEASE...v2.3.1.RELEASE)

Updates `spring-boot-test` from 2.1.0.RELEASE to 2.3.1.RELEASE
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.1.0.RELEASE...v2.3.1.RELEASE)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -46,7 +46,7 @@
     <apache.commons.collections4.version>4.1</apache.commons.collections4.version>
     <apache.commons.compress>1.19</apache.commons.compress>
     <common.codec.version>1.11</common.codec.version>
-    <spring.boot.version>2.1.0.RELEASE</spring.boot.version>
+    <spring.boot.version>2.3.1.RELEASE</spring.boot.version>
     <spring.version>5.1.2.RELEASE</spring.version>
   </properties>