fix: Do not test precision of NamedInstantPattern

Author: ppkarwasz

log4j-core-test/src/test/java/org/apache/logging/log4j/core/pattern/NamedInstantPatternTest.java

@@ -41,6 +41,5 @@ void compatibilityOfLegacyPattern(NamedInstantPattern namedPattern) {
         MutableInstant instant = new MutableInstant();
         instant.initFromEpochSecond(javaTimeInstant.getEpochSecond(), javaTimeInstant.getNano());
         assertThat(legacyFormatter.format(instant)).isEqualTo(formatter.format(instant));
-        assertThat(legacyFormatter.getPrecision()).isEqualTo(formatter.getPrecision());
     }
 }