fix: add blank lines before return statements (nlreturn)

Fix nlreturn linting issues by adding blank lines before return
statements in cli and secret packages.

internal/secret/crypto.go

@@ -40,6 +40,7 @@ func EncryptToRecipient(data []byte, recipient age.Recipient) ([]byte, error) {
 
 	result := buf.Bytes()
 	Debug("EncryptToRecipient completed successfully", "result_length", len(result))
+
 	return result, nil
 }