build(deps): bump spring-boot-maven-plugin from 2.1.3.RELEASE to 2.5.5

Bumps [spring-boot-maven-plugin](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-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

blog-deploy/pom.xml

@@ -88,7 +88,7 @@
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
-                <version>2.1.3.RELEASE</version>
+                <version>2.5.5</version>
                 <configuration>
                     <mainClass>cn.celess.BlogApplication</mainClass>
                 </configuration>