build(deps): bump org.bouncycastle:bcpg-jdk18on from 1.83 to 1.84

Bumps [org.bouncycastle:bcpg-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:bcpg-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]

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-bouncy-castle = "1.83"
+bouncy-castle = "1.84"
 shadow = "9.3.1"
 kotlin = "2.3.10"
 kotlinx = "1.10.2"