Remove unused imports

pg/src/main/java/org/bouncycastle/openpgp/PGPSecretKeyRing.java

@@ -19,7 +19,6 @@
 import org.bouncycastle.bcpg.KeyIdentifier;
 import org.bouncycastle.bcpg.PacketFormat;
 import org.bouncycastle.bcpg.PacketTags;
-import org.bouncycastle.bcpg.PublicKeyUtils;
 import org.bouncycastle.bcpg.PublicSubkeyPacket;
 import org.bouncycastle.bcpg.SecretKeyPacket;
 import org.bouncycastle.bcpg.SecretSubkeyPacket;

pg/src/main/java/org/bouncycastle/openpgp/api/OpenPGPV6KeyGenerator.java

@@ -26,7 +26,6 @@
 import org.bouncycastle.openpgp.operator.PGPDigestCalculatorProvider;
 import org.bouncycastle.openpgp.operator.PGPKeyPairGenerator;
 import org.bouncycastle.openpgp.operator.PGPKeyPairGeneratorProvider;
-import org.bouncycastle.openpgp.operator.bc.BcKeyFingerprintCalculator;
 import org.bouncycastle.util.Arrays;
 
 import java.io.IOException;