Bump org.bouncycastle:bcprov-jdk18on from 1.80 to 1.81 in /versions (#13504)

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
...

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Author: dependabot[bot]

versions/build.gradle.kts

@@ -101,7 +101,7 @@ dependencies.constraints {
     api("org.apache.pdfbox:pdfbox:$pdfbox")
     api("org.apache.pdfbox:xmpbox:$pdfbox")
     api("org.apache.velocity:velocity-engine-core:2.4.1")
-    api("org.bouncycastle:bcprov-jdk18on:1.80")
+    api("org.bouncycastle:bcprov-jdk18on:1.81")
     api("org.controlsfx:controlsfx:11.2.2")
     api("org.eclipse.jgit:org.eclipse.jgit:7.3.0.202506031305-r")
     api("org.fxmisc.flowless:flowless:0.7.4")