Bump org.bouncycastle:bcpkix-jdk18on

Bumps [org.bouncycastle:bcpkix-jdk18on](https://github.com/bcgit/bc-java) from 1.76 to 1.78.
- [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-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

bundles/org.openhab.core.io.jetty.certificate/pom.xml

@@ -17,7 +17,7 @@
     <dependency>
       <groupId>org.bouncycastle</groupId>
       <artifactId>bcpkix-jdk18on</artifactId>
-      <version>1.76</version>
+      <version>1.78</version>
     </dependency>
   </dependencies>