Bump springBootVersion from 2.4.3 to 2.4.4

Bumps `springBootVersion` from 2.4.3 to 2.4.4.

Updates `spring-boot-gradle-plugin` from 2.4.3 to 2.4.4
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.4.3...v2.4.4)

Updates `spring-boot-dependencies` from 2.4.3 to 2.4.4
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.4.3...v2.4.4)

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

Author: dependabot[bot]

build.gradle

@@ -15,7 +15,7 @@
  */
 
 buildscript {
-    def springBootVersion = '2.4.3'
+    def springBootVersion = '2.4.4'
     def sonarqubeVersion = '3.1.1'
     def asciidoctorGradleVersion = '1.6.1'
     def artifactoryVersion = '4.20.0'