build(deps): bump spring-boot-starter-parent from 2.1.3.RELEASE to 2.5.5

Bumps [spring-boot-starter-parent](https://github.com/spring-projects/spring-boot) from 2.1.3.RELEASE to 2.5.5.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.1.3.RELEASE...v2.5.5)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-parent
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -19,7 +19,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.1.3.RELEASE</version>
+        <version>2.5.5</version>
         <relativePath/>
     </parent>
     <groupId>cn.celess</groupId>