Bump spring-boot.version from 2.6.5 to 2.6.6

Bumps `spring-boot.version` from 2.6.5 to 2.6.6.

Updates `spring-boot-starter-parent` from 2.6.5 to 2.6.6
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.6.5...v2.6.6)

Updates `spring-boot-maven-plugin` from 2.6.5 to 2.6.6
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.6.5...v2.6.6)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-parent
  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] <support@github.com>

pom.xml

@@ -89,7 +89,7 @@
     <mybatis-velocity.version>2.1.1</mybatis-velocity.version>
     <mybatis-freemarker.version>1.2.3</mybatis-freemarker.version>
     <mybatis-dynamic-sql.version>1.4.0</mybatis-dynamic-sql.version>
-    <spring-boot.version>2.6.5</spring-boot.version>
+    <spring-boot.version>2.6.6</spring-boot.version>
     <spring-native.version>0.11.3</spring-native.version>
   </properties>