Fix TestVersion for Jackson 2.16 and 2.17

The test has started to fail since Jackson 2.16.0 because of the following changes:

- FasterXML/jackson-core#1053
- FasterXML/jackson-core#1142

These were "fixing" the following issues:

- FasterXML/jackson-core#1050
- FasterXML/jackson-core#1141

src/test/java/org/embulk/util/config/TestVersion.java

@@ -31,11 +31,11 @@ public void testParseVersion() throws Exception {
                      Version.parseVersionForTesting("14.139-SNAPSHOT"));
         assertEquals(new com.fasterxml.jackson.core.Version(103, 0, 0, "SNAPSHOT-A", "org.embulk", "embulk-util-config"),
                      Version.parseVersionForTesting("103-SNAPSHOT-A"));
-        assertEquals(new com.fasterxml.jackson.core.Version(5, 3, 1, "", "org.embulk", "embulk-util-config"),
+        assertEquals(new com.fasterxml.jackson.core.Version(5, 3, 1, null, "org.embulk", "embulk-util-config"),
                      Version.parseVersionForTesting("5.3.1"));
-        assertEquals(new com.fasterxml.jackson.core.Version(9, 8, 0, "", "org.embulk", "embulk-util-config"),
+        assertEquals(new com.fasterxml.jackson.core.Version(9, 8, 0, null, "org.embulk", "embulk-util-config"),
                      Version.parseVersionForTesting("9.8"));
-        assertEquals(new com.fasterxml.jackson.core.Version(4, 0, 0, "", "org.embulk", "embulk-util-config"),
+        assertEquals(new com.fasterxml.jackson.core.Version(4, 0, 0, null, "org.embulk", "embulk-util-config"),
                      Version.parseVersionForTesting("4"));
 
         assertThrows(IllegalArgumentException.class, () -> Version.parseVersionForTesting(""));