Bump org.eclipse.microprofile:microprofile in /sample-apps/liberty-app

Bumps [org.eclipse.microprofile:microprofile](https://github.com/eclipse/microprofile) from 3.0 to 6.1.
- [Release notes](https://github.com/eclipse/microprofile/releases)
- [Commits](eclipse/microprofile@3.0...6.1)

---
updated-dependencies:
- dependency-name: org.eclipse.microprofile:microprofile
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

sample-apps/liberty-app/build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 dependencies {
   api 'javax:javaee-api:8.0.1'
-  api 'org.eclipse.microprofile:microprofile:3.0'
+  api 'org.eclipse.microprofile:microprofile:6.1'
 
   testImplementation project(':microshed-testing-liberty')
   testImplementation project(':microshed-testing-core')