Bump rho-mu from 3.0.3 to 3.0.4

Bumps [rho-mu](https://github.com/cicirello/rho-mu) from 3.0.3 to 3.0.4.
- [Release notes](https://github.com/cicirello/rho-mu/releases)
- [Changelog](https://github.com/cicirello/rho-mu/blob/main/CHANGELOG.md)
- [Commits](cicirello/rho-mu@v3.0.3...v3.0.4)

---
updated-dependencies:
- dependency-name: org.cicirello:rho-mu
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -197,7 +197,7 @@
 		<dependency>
 			<groupId>org.cicirello</groupId>
 			<artifactId>rho-mu</artifactId>
-			<version>3.0.3</version>
+			<version>3.0.4</version>
 		</dependency>
 		<dependency>
 			<groupId>org.cicirello</groupId>