Bump org.springframework.boot from 2.6.2 to 2.6.3 (#35)

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 2.6.2 to 2.6.3.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.6.2...v2.6.3)

---
updated-dependencies:
- dependency-name: org.springframework.boot
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -1,7 +1,7 @@
 import org.apache.tools.ant.filters.ReplaceTokens
 
 plugins {
-    id 'org.springframework.boot' version '2.6.2'
+    id 'org.springframework.boot' version '2.6.3'
     id 'io.spring.dependency-management' version '1.0.11.RELEASE'
     id 'groovy'
     id 'application'