Bump org.springframework.shell:spring-shell-starter from 3.1.5 to 3.4.0

Bumps [org.springframework.shell:spring-shell-starter](https://github.com/spring-projects/spring-shell) from 3.1.5 to 3.4.0.
- [Release notes](https://github.com/spring-projects/spring-shell/releases)
- [Commits](spring-projects/spring-shell@v3.1.5...v3.4.0)

---
updated-dependencies:
- dependency-name: org.springframework.shell:spring-shell-starter
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

hawkbit-sdk/hawkbit-sdk-demo/pom.xml

@@ -25,7 +25,7 @@
     <description>Test / Example of how SDK could be used to for devices and for Mgmt API access</description>
 
     <properties>
-        <spring-shell.version>3.1.5</spring-shell.version>
+        <spring-shell.version>3.4.0</spring-shell.version>
         <spring.app.class>org.eclipse.hawkbit.sdk.demo.multidevice.MultiDeviceApp</spring.app.class>
         <start-class>${spring.app.class}</start-class>
     </properties>