Bump org.bouncycastle:bcprov-jdk18on

Bumps the maven group with 1 update in the / directory: [org.bouncycastle:bcprov-jdk18on](https://github.com/bcgit/bc-java).


Updates `org.bouncycastle:bcprov-jdk18on` 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
  dependency-group: maven
...

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

pom.xml

@@ -30,7 +30,7 @@
     <properties>
         <grpc.version>1.61.1</grpc.version>
         <protobuf.version>3.25.3</protobuf.version> <!-- Must match version used by grpc-protobuf -->
-        <bouncycastle.version>1.77</bouncycastle.version>
+        <bouncycastle.version>1.78</bouncycastle.version>
         <httpclient.version>4.5.14</httpclient.version>
         <javadoc.version>3.6.3</javadoc.version>
         <skipITs>true</skipITs>