Bump org.webjars.npm:bootstrap-italia from 2.13.3 to 2.13.4

Bumps [org.webjars.npm:bootstrap-italia](https://github.com/italia/bootstrap-italia) from 2.13.3 to 2.13.4.
- [Release notes](https://github.com/italia/bootstrap-italia/releases)
- [Changelog](https://github.com/italia/bootstrap-italia/blob/main/CHANGELOG.md)
- [Commits](italia/bootstrap-italia@v2.13.3...v2.13.4)

---
updated-dependencies:
- dependency-name: org.webjars.npm:bootstrap-italia
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

bootstrap-themes/pom.xml

@@ -14,7 +14,7 @@
     <name>bootstrap-themes</name>
 
     <properties>
-        <bootstrap-italia.version>2.13.3</bootstrap-italia.version>        
+        <bootstrap-italia.version>2.13.4</bootstrap-italia.version>        
     </properties>
 
     <dependencies>