fix: benchmark/pom.xml to reduce vulnerabilities (#1303)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-1035561

benchmark/pom.xml

@@ -66,7 +66,7 @@
     <dependency>
       <groupId>org.bouncycastle</groupId>
       <artifactId>bcprov-jdk15on</artifactId>
-      <version>1.60</version>
+      <version>1.61</version>
     </dependency>
     <dependency>
       <groupId>io.reactivex</groupId>