fix watchOS 32bit integers

Author: swhitty

Tests/KeyValueDecoderTests.swift

@@ -425,7 +425,7 @@ struct KeyValueDecoderTests {
 
         decoder.dateDecodingStrategy = .millisecondsSince1970
         #expect(
-            try decoder.decode(Date.self, from: 978307200000) == referenceDate
+            try decoder.decode(Date.self, from: Int64(978307200000)) == referenceDate
         )
 
         decoder.dateDecodingStrategy = .secondsSince1970

Tests/KeyValueEncoderTests.swift

@@ -687,12 +687,12 @@ struct KeyValueEncodedTests {
 
         encoder.dateEncodingStrategy = .millisecondsSince1970
         #expect(
-            try encoder.encode(referenceDate) as? Int == 978307200000
+            try encoder.encode(referenceDate) as? Int64 == 978307200000
         )
 
         encoder.dateEncodingStrategy = .secondsSince1970
         #expect(
-            try encoder.encode(referenceDate) as? Int == 978307200
+            try encoder.encode(referenceDate) as? Int64 == 978307200
         )
 
 #if compiler(>=6.1)