RATIS-2513. Bump bouncycastle.version from 1.83 to 1.84 (apache#1437)

Author: dependabot[bot]

ratis-test/pom.xml

@@ -24,7 +24,7 @@
   <name>Apache Ratis Test</name>
 
   <properties>
-    <bouncycastle.version>1.83</bouncycastle.version>
+    <bouncycastle.version>1.84</bouncycastle.version>
   </properties>
 
   <dependencies>