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](mojohaus/flatten-maven-plugin@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] <[email protected]>

Author: dependabot[bot]

spi-fly/pom.xml

@@ -60,7 +60,7 @@
         <felix.log.extension.version>1.0.0</felix.log.extension.version>
         <felix.log.version>1.3.0</felix.log.version>
         <felix.logback.version>1.0.6</felix.logback.version>
-        <flatten-maven-plugin.version>1.7.2</flatten-maven-plugin.version>
+        <flatten-maven-plugin.version>1.7.3</flatten-maven-plugin.version>
         <junit-jupiter.version>5.13.4</junit-jupiter.version>
         <junit-platform.version>1.13.4</junit-platform.version>
         <junit.version>4.13.2</junit.version>