Update USE version after release of $v7.5.0

## Description

After the release of USE version $v7.5.0 it is time to change
the version to a new one. For this, please change the following files:

* ./pom.xml
* ./use-assembly/pom.xml
* ./use-core/pom.xml
* ./use-core/src/main/java/org/tzi/use/config/Options.java
* ./use-gui/pom.xml