Bump spring-boot.version from 2.6.3 to 2.6.7 (#1926)

Bumps `spring-boot.version` from 2.6.3 to 2.6.7.

Updates `spring-boot-starter-webflux` from 2.6.3 to 2.6.7
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.6.3...v2.6.7)

Updates `spring-boot-starter-validation` from 2.6.3 to 2.6.7
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.6.3...v2.6.7)

Updates `spring-boot-dependencies` from 2.6.3 to 2.6.7
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.6.3...v2.6.7)

Updates `spring-boot-maven-plugin` from 2.6.3 to 2.6.7
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.6.3...v2.6.7)

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

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

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

pom.xml

@@ -14,7 +14,7 @@
         <maven.compiler.target>13</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-        <spring-boot.version>2.6.3</spring-boot.version>
+        <spring-boot.version>2.6.7</spring-boot.version>
         <jackson-databind-nullable.version>0.2.2</jackson-databind-nullable.version>
         <org.mapstruct.version>1.4.2.Final</org.mapstruct.version>
         <org.projectlombok.version>1.18.20</org.projectlombok.version>