Bump org.springframework.boot:spring-boot-starter-webflux

Bumps [org.springframework.boot:spring-boot-starter-webflux](https://github.com/spring-projects/spring-boot) from 2.6.0 to 2.6.6.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.6.0...v2.6.6)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-webflux
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

kotlin-self-executable-jar/kotlin-spring-executable/pom.xml

@@ -136,7 +136,7 @@
     </build>
 
     <properties>
-        <spring-boot.version>2.6.0</spring-boot.version>
+        <spring-boot.version>2.6.6</spring-boot.version>
         <kotlin.version>1.8.0</kotlin.version>
         <java.version>11</java.version>
     </properties>