fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-6612984
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-6613076
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-6613079

pom.xml

@@ -35,7 +35,7 @@
 
   <!-- Set our Language Level to Java 8 -->
   <properties>
-    <bouncycastle.version>1.77</bouncycastle.version>
+    <bouncycastle.version>1.78</bouncycastle.version>
     <codehaus.version>1.9.13</codehaus.version>
     <commonscodec.version>1.15</commonscodec.version>
     <commonscollections.version>3.2.2</commonscollections.version>