Bump org.bouncycastle:bcpkix-jdk18on from 1.80 to 1.81 (#2430)

Bumps [org.bouncycastle:bcpkix-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:bcpkix-jdk18on
  dependency-version: '1.81'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

hawkbit-sdk/pom.xml

@@ -26,7 +26,7 @@
     <properties>
         <spring-cloud-starter-openfeign.version>4.3.0</spring-cloud-starter-openfeign.version>
         <openfeign-hc5.version>13.6</openfeign-hc5.version>
-        <bouncycastle.version>1.80</bouncycastle.version>
+        <bouncycastle.version>1.81</bouncycastle.version>
         <java.version>${java.client.version}</java.version>
     </properties>