Attempt to fix issue #102 (#104)

After the explanation received by Stephen
(swiftlang/swift-foundation#1561 (comment)),
change the test to make it pass with Double+Double date precision

Author: sebsto

Tests/AWSLambdaEventsTests/S3Tests.swift

@@ -111,7 +111,7 @@ struct S3Tests {
         #expect(record.eventSource == "aws:s3")
         #expect(record.awsRegion == .eu_central_1)
         #expect(record.eventName == "ObjectCreated:Put")
-        #expect(record.eventTime == Date(timeIntervalSince1970: 1_578_907_540.621))
+        #expect(record.eventTime.ISO8601Format() == Date(timeIntervalSince1970: 1_578_907_540.621).ISO8601Format())
         #expect(record.userIdentity == S3Event.UserIdentity(principalId: "AWS:AAAAAAAJ2MQ4YFQZ7AULJ"))
         #expect(record.requestParameters == S3Event.RequestParameters(sourceIPAddress: "123.123.123.123"))
         #expect(record.responseElements.count == 2)
@@ -135,7 +135,7 @@ struct S3Tests {
         #expect(record.eventSource == "aws:s3")
         #expect(record.awsRegion == .eu_central_1)
         #expect(record.eventName == "ObjectRemoved:DeleteMarkerCreated")
-        #expect(record.eventTime == Date(timeIntervalSince1970: 1_578_907_540.621))
+        #expect(record.eventTime.ISO8601Format() == Date(timeIntervalSince1970: 1_578_907_540.621).ISO8601Format())
         #expect(record.userIdentity == S3Event.UserIdentity(principalId: "AWS:AAAAAAAJ2MQ4YFQZ7AULJ"))
         #expect(record.requestParameters == S3Event.RequestParameters(sourceIPAddress: "123.123.123.123"))
         #expect(record.responseElements.count == 2)