Bump org.bouncycastle:bcpkix-jdk18on from 1.72 to 1.73

Bumps [org.bouncycastle:bcpkix-jdk18on](https://github.com/bcgit/bc-java) from 1.72 to 1.73.
- [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-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -57,7 +57,7 @@
     <spring-security-oauth2.version>2.3.3.RELEASE</spring-security-oauth2.version>
     <nimbus-jose-jwt.version>6.0.2</nimbus-jose-jwt.version>
     <mock-server.version>5.5.1</mock-server.version>
-    <bouncycastle.version>1.72</bouncycastle.version>
+    <bouncycastle.version>1.73</bouncycastle.version>
 
   </properties>