build(deps): bump de.jflex:jflex from 1.6.0 to 1.9.1 (#1554)

Bumps [de.jflex:jflex](https://github.com/jflex-de/jflex) from 1.6.0 to 1.9.1.
- [Release notes](https://github.com/jflex-de/jflex/releases)
- [Changelog](https://github.com/jflex-de/jflex/blob/master/RELEASE.md)
- [Commits](jflex-de/jflex@v1.6.0...v1.9.1)

---
updated-dependencies:
- dependency-name: de.jflex:jflex
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Ed Shryane <[email protected]>

whois-rpsl/pom.xml

@@ -58,7 +58,7 @@
                     <dependency>
                         <groupId>de.jflex</groupId>
                         <artifactId>jflex</artifactId>
-                        <version>1.6.0</version>
+                        <version>1.9.1</version>
                     </dependency>
                 </dependencies>
                 <groupId>org.codehaus.mojo</groupId>