deps: Update bouncycastle.version to v1.78.1 (#513)

Author: renovate-bot

pom.xml

@@ -61,7 +61,7 @@
     <project.javadoc.protobufBaseURL>https://googleapis.dev/java/google-api-grpc/latest</project.javadoc.protobufBaseURL>
     <error-prone.version>2.26.1</error-prone.version>
     <native-image.version>0.10.1</native-image.version>
-    <bouncycastle.version>1.78</bouncycastle.version>
+    <bouncycastle.version>1.78.1</bouncycastle.version>
   </properties>
 
   <dependencyManagement>