Bump flatten-maven-plugin from 1.4.1 to 1.5.0 (#671)

* Bump flatten-maven-plugin from 1.4.1 to 1.5.0

Bumps [flatten-maven-plugin](https://github.com/mojohaus/flatten-maven-plugin) from 1.4.1 to 1.5.0.
- [Release notes](https://github.com/mojohaus/flatten-maven-plugin/releases)
- [Commits](mojohaus/flatten-maven-plugin@1.4.1...1.5.0)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:flatten-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

* monthly

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Hilmar Falkenberg <hilmar.falkenberg@sap.com>

.github/dependabot.yml

@@ -5,7 +5,7 @@ updates:
     directory: "/"
     schedule:
       # Check for updates once a day. This can be changed later on to `weekly` if desired.
-      interval: "daily"
+      interval: "monthly"
     # Add reviewers
     reviewers:
       - "corona-warn-app/cwa-ppa-server-codeowners"

pom.xml

@@ -536,7 +536,7 @@
         <plugin>
           <groupId>org.codehaus.mojo</groupId>
           <artifactId>flatten-maven-plugin</artifactId>
-          <version>1.4.1</version>
+          <version>1.5.0</version>
           <configuration>
             <updatePomFile>true</updatePomFile>
             <flattenMode>resolveCiFriendliesOnly</flattenMode>