Bump spring.boot.version from 2.1.5.RELEASE to 2.1.7.RELEASE

Bumps `spring.boot.version` from 2.1.5.RELEASE to 2.1.7.RELEASE.

Updates `spring-boot-dependencies` from 2.1.5.RELEASE to 2.1.7.RELEASE
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.1.5.RELEASE...v2.1.7.RELEASE)

Updates `spring-boot-maven-plugin` from 2.1.5.RELEASE to 2.1.7.RELEASE
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.1.5.RELEASE...v2.1.7.RELEASE)

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

Author: dependabot-preview[bot]

springboot-example/pom.xml

@@ -14,7 +14,7 @@
     <packaging>pom</packaging>
 
     <properties>
-        <spring.boot.version>2.1.5.RELEASE</spring.boot.version>
+        <spring.boot.version>2.1.7.RELEASE</spring.boot.version>
         <spring.cloud.version>Greenwich.SR1</spring.cloud.version>
     </properties>