Update to bouncycastle 1.81

Author: simonsteiner1984

fop-core/pom.xml

@@ -114,13 +114,13 @@
     <dependency>
       <groupId>org.bouncycastle</groupId>
       <artifactId>bcpkix-jdk15to18</artifactId>
-      <version>1.78.1</version>
+      <version>1.81</version>
       <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.bouncycastle</groupId>
       <artifactId>bcprov-jdk15to18</artifactId>
-      <version>1.78.1</version>
+      <version>1.81</version>
       <scope>provided</scope>
     </dependency>
     <dependency>