Bump opal.version from 5.0.0 to 6.0.0

Bumps `opal.version` from 5.0.0 to 6.0.0.

Updates `de.opal-project:common_2.13` from 5.0.0 to 6.0.0
- [Release notes](https://github.com/opalj/opal/releases)
- [Changelog](https://github.com/opalj/opal/blob/develop/Changes.md)
- [Commits](opalj/opal@5.0.0...6.0.0)

Updates `de.opal-project:bytecode-representation_2.13` from 5.0.0 to 6.0.0
- [Release notes](https://github.com/opalj/opal/releases)
- [Changelog](https://github.com/opalj/opal/blob/develop/Changes.md)
- [Commits](opalj/opal@5.0.0...6.0.0)

Updates `de.opal-project:three-address-code_2.13` from 5.0.0 to 6.0.0
- [Release notes](https://github.com/opalj/opal/releases)
- [Changelog](https://github.com/opalj/opal/blob/develop/Changes.md)
- [Commits](opalj/opal@5.0.0...6.0.0)

---
updated-dependencies:
- dependency-name: de.opal-project:common_2.13
  dependency-version: 6.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
- dependency-name: de.opal-project:bytecode-representation_2.13
  dependency-version: 6.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
- dependency-name: de.opal-project:three-address-code_2.13
  dependency-version: 6.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

pom.xml

@@ -50,7 +50,7 @@
         <spds.version>4.3.2</spds.version>
         <soot.version>4.6.0</soot.version>
         <sootup.version>2.0.0</sootup.version>
-        <opal.version>5.0.0</opal.version>
+        <opal.version>6.0.0</opal.version>
         <crysl.version>4.0.5</crysl.version>
         <junit.version>6.0.1</junit.version>
         <guava.version>33.5.0-jre</guava.version>