Bump org.bouncycastle:bcprov-jdk18on from 1.83 to 1.84

Bumps [org.bouncycastle:bcprov-jdk18on](https://github.com/bcgit/bc-java) from 1.83 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:bcprov-jdk18on
  dependency-version: '1.84'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

dependencies.gradle

@@ -114,7 +114,7 @@ dependencies {
         implementation('org.apache.james:apache-mime4j-core:0.8.13') {
             because 'CVE-2024-21742'
         }
-        implementation('org.bouncycastle:bcprov-jdk18on:1.83') {
+        implementation('org.bouncycastle:bcprov-jdk18on:1.84') {
             because 'CVE-2024-29857, CVE-2024-30171, CVE-2024-30172, CVE-2024-34447'
         }
         implementation('org.testng:testng:7.12.0') {