build(deps): bump org.bouncycastle:bcprov-jdk18on from 1.81 to 1.84

Bumps [org.bouncycastle:bcprov-jdk18on](https://github.com/bcgit/bc-java) from 1.81 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
...

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

Author: dependabot[bot]

pom.xml

@@ -13,7 +13,7 @@
     <properties>
         <java.version>11</java.version>
         <jjwt.version>0.12.6</jjwt.version>
-        <bouncycastle.version>1.81</bouncycastle.version>
+        <bouncycastle.version>1.84</bouncycastle.version>
         <jackson.version>2.19.1</jackson.version>
         <slf4j.version>2.0.17</slf4j.version>
         <junit-jupiter.version>5.13.3</junit-jupiter.version>