Make tests work on Java 8

Author: jyemin

bson/src/test/unit/org/bson/codecs/IterableCodecSpecification.groovy

@@ -185,9 +185,11 @@ class IterableCodecSpecification extends Specification {
 
         then:
         writer.getDocument() == new BsonDocument()
-                .append('instants', new BsonArray(List.of(
-                        new BsonDocument('firstMap', new BsonArray(List.of(new BsonDateTime(1), new BsonDateTime(2)))),
-                        new BsonDocument('secondMap', new BsonArray(List.of(new BsonDateTime(3), new BsonDateTime(4)))))))
+                .append('instants', new BsonArray(
+                        [
+                                new BsonDocument('firstMap', new BsonArray([new BsonDateTime(1), new BsonDateTime(2)])),
+                                new BsonDocument('secondMap', new BsonArray([new BsonDateTime(3), new BsonDateTime(4)]))
+                        ]))
 
         when:
         reader.readStartDocument()

bson/src/test/unit/org/bson/codecs/MapCodecSpecification.groovy

@@ -249,8 +249,9 @@ class MapCodecSpecification extends Specification {
         then:
         writer.getDocument() == new BsonDocument()
                 .append('instants',
-                        new BsonDocument('firstMap', new BsonArray(List.of(new BsonDateTime(1), new BsonDateTime(2))))
-                        .append('secondMap', new BsonArray(List.of(new BsonDateTime(3), new BsonDateTime(4)))))
+                        new BsonDocument()
+                                .append('firstMap', new BsonArray([new BsonDateTime(1), new BsonDateTime(2)]))
+                                .append('secondMap', new BsonArray([new BsonDateTime(3), new BsonDateTime(4)])))
 
         when:
         reader.readStartDocument()