RM-3063: suppress sonar warnings in ECKeysTest

Author: OlesjaAarma

cdoc2-lib/src/test/java/ee/cyber/cdoc2/crypto/ECKeysTest.java

@@ -37,6 +37,7 @@ class ECKeysTest {
     private static final Logger log = LoggerFactory.getLogger(ECKeysTest.class);
 
     @Test
+    @SuppressWarnings({"java:S1481", "java:S1854"})
     void testBigInteger() {
         byte[] neg = new BigInteger("-255").toByteArray(); //0xff, 0x01
         byte[] neg254 = new BigInteger("-254").toByteArray(); //0xff, 0x02