Bump org.bouncycastle:bcprov-jdk18on from 1.80 to 1.81 (#84)

Bumps [org.bouncycastle:bcprov-jdk18on](https://github.com/bcgit/bc-java) from 1.80 to 1.81.
- [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: '1.81'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -20,7 +20,7 @@ apache-commons-compress = "1.26.2"
 maven-publish = "0.33.0"
 
 # other
-bouncycastle = "1.80"
+bouncycastle = "1.81"
 logback = "1.5.18"
 
 [libraries]