Bump spring-boot.version from 2.5.5 to 2.5.6 (#164)

Bumps `spring-boot.version` from 2.5.5 to 2.5.6.

Updates `spring-boot-dependencies` from 2.5.5 to 2.5.6
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.5.5...v2.5.6)

Updates `spring-boot-starter-test` from 2.5.5 to 2.5.6
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.5.5...v2.5.6)

Updates `spring-boot-maven-plugin` from 2.5.5 to 2.5.6
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.5.5...v2.5.6)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-dependencies
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-starter-test
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -55,7 +55,7 @@
         <maven.compiler.target>1.8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <!--dependencies-->
-        <spring-boot.version>2.5.5</spring-boot.version>
+        <spring-boot.version>2.5.6</spring-boot.version>
         <spring-shell.version>2.0.1.RELEASE</spring-shell.version>
         <sshd.version>2.7.0</sshd.version>
         <junit-jupiter.version>5.8.1</junit-jupiter.version>