Update dependency org.hyperledger.besu:secp256k1 to v0.7.1

Author: renovate[bot]

gradle/versions.gradle

@@ -148,7 +148,7 @@ dependencyManagement {
     dependency 'org.fusesource.jansi:jansi:2.4.0'
 
     dependency 'org.hyperledger.besu:bls12-381:0.6.0'
-    dependency 'org.hyperledger.besu:secp256k1:0.6.0'
+    dependency 'org.hyperledger.besu:secp256k1:0.7.1'
     dependency 'org.hyperledger.besu:secp256r1:0.6.0'
     dependency 'org.hyperledger.besu:blake2bf:0.6.0'