Update to bcprov-jdk15on:1.61

Fixes gh-6788

gradle/dependency-management.gradle

@@ -146,7 +146,7 @@ dependencyManagement {
 		dependency 'org.assertj:assertj-core:3.11.1'
 		dependency 'org.attoparser:attoparser:2.0.4.RELEASE'
 		dependency 'org.bouncycastle:bcpkix-jdk15on:1.61'
-		dependency 'org.bouncycastle:bcprov-jdk15on:1.58'
+		dependency 'org.bouncycastle:bcprov-jdk15on:1.61'
 		dependency 'org.codehaus.groovy:groovy-all:2.4.14'
 		dependency 'org.codehaus.groovy:groovy-json:2.4.14'
 		dependency 'org.codehaus.groovy:groovy:2.4.14'