Bump de.rub.nds:protocol-toolkit-bom from 6.0.1 to 6.2.1

---
updated-dependencies:
- dependency-name: de.rub.nds:protocol-toolkit-bom
  dependency-version: 6.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -4,7 +4,7 @@
     <parent>
         <groupId>de.rub.nds</groupId>
         <artifactId>protocol-toolkit-bom</artifactId>
-        <version>6.0.1</version>
+        <version>6.2.1</version>
     </parent>
 
     <groupId>de.rub.nds.tls</groupId>