Bump springBootVersion from 4.0.5 to 4.0.6

Bumps `springBootVersion` from 4.0.5 to 4.0.6.

Updates `org.springframework.boot:spring-boot-starter-web` from 4.0.5 to 4.0.6
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v4.0.5...v4.0.6)

Updates `org.springframework.boot:spring-boot-starter-actuator` from 4.0.5 to 4.0.6
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v4.0.5...v4.0.6)

Updates `org.springframework.boot:spring-boot-configuration-processor` from 4.0.5 to 4.0.6
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v4.0.5...v4.0.6)

Updates `org.springframework.boot:spring-boot-starter-test` from 4.0.5 to 4.0.6
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v4.0.5...v4.0.6)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-web
  dependency-version: 4.0.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-starter-actuator
  dependency-version: 4.0.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-configuration-processor
  dependency-version: 4.0.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-starter-test
  dependency-version: 4.0.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle

@@ -19,7 +19,7 @@ group = 'com.digitalsanctuary.cf.turnstile'
 description = 'SpringBoot Cloudflare Turnstile Library'
 
 ext {
-    springBootVersion = '4.0.5'
+    springBootVersion = '4.0.6'
     lombokVersion = '1.18.44'
 }