Bump org.sonarsource.scanner.maven:sonar-maven-plugin in /portfolio-app

Bumps [org.sonarsource.scanner.maven:sonar-maven-plugin](https://github.com/SonarSource/sonar-scanner-maven) from 5.6.0.6792 to 5.7.0.6970.
- [Release notes](https://github.com/SonarSource/sonar-scanner-maven/releases)
- [Commits](SonarSource/sonar-scanner-maven@5.6.0.6792...5.7.0.6970)

---
updated-dependencies:
- dependency-name: org.sonarsource.scanner.maven:sonar-maven-plugin
  dependency-version: 5.7.0.6970
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

portfolio-app/pom.xml

@@ -584,7 +584,7 @@
 				<plugin>
 					<groupId>org.sonarsource.scanner.maven</groupId>
 					<artifactId>sonar-maven-plugin</artifactId>
-					<version>5.6.0.6792</version>
+					<version>5.7.0.6970</version>
 				</plugin>
 				<plugin>
 					<groupId>name.abuchen</groupId>