Bump org.bouncycastle:bcprov-jdk18on from 1.77 to 1.78 in /rxlib

Bumps [org.bouncycastle:bcprov-jdk18on](https://github.com/bcgit/bc-java) from 1.77 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:bcprov-jdk18on
  dependency-type: direct:production
...

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

rxlib/pom.xml

@@ -24,7 +24,7 @@
  <zip4j.version>2.11.3</zip4j.version>
  <h2.version>2.2.224</h2.version>
  <netty.version>4.1.106.Final</netty.version>
- <bcprov.version>1.77</bcprov.version>
+ <bcprov.version>1.78</bcprov.version>
  <okhttp.version>4.11.0</okhttp.version>
  <sshd.version>2.12.1</sshd.version>
  <jsch.version>0.1.55</jsch.version>