Bump org.bouncycastle:bcpkix-jdk18on in /test/protocol-tests

Bumps [org.bouncycastle:bcpkix-jdk18on](https://github.com/bcgit/bc-java) from 1.80 to 1.84.
- [Changelog](https://github.com/bcgit/bc-java/blob/main/docs/releasenotes.html)
- [Commits](https://github.com/bcgit/bc-java/commits)

---
updated-dependencies:
- dependency-name: org.bouncycastle:bcpkix-jdk18on
  dependency-version: '1.84'
  dependency-type: direct:development
...

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

Author: dependabot[bot]

test/protocol-tests/pom.xml

@@ -293,7 +293,7 @@
         <dependency>
             <groupId>org.bouncycastle</groupId>
             <artifactId>bcpkix-jdk18on</artifactId>
-            <version>1.80</version>
+            <version>1.84</version>
             <scope>test</scope>
         </dependency>
         <dependency>