Bump org.codehaus.mojo:flatten-maven-plugin from 1.7.2 to 1.7.3

Bumps [org.codehaus.mojo:flatten-maven-plugin](https://github.com/mojohaus/flatten-maven-plugin) from 1.7.2 to 1.7.3.
- [Release notes](https://github.com/mojohaus/flatten-maven-plugin/releases)
- [Commits](https://github.com/mojohaus/flatten-maven-plugin/compare/1.7.2...1.7.3)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:flatten-maven-plugin
  dependency-version: 1.7.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

tck/pom.xml

diff --git a/tck/pom.xml b/tck/pom.xml
index 2dd8108..0d416bb 100644
--- a/tck/pom.xml
+++ b/tck/pom.xml
@@ -141,7 +141,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>flatten-maven-plugin</artifactId>
-                <version>1.7.2</version>
+                <version>1.7.3</version>
                 <configuration>
                     <flattenMode>ossrh</flattenMode>
                 </configuration>