Update kotlinx-datetime to 0.6.1

Force millisecond timestamps for equality
Kotlin/kotlinx-datetime#439

Author: jeffdgr8

couchbase-lite/src/commonTest/kotlin/kotbase/DocumentTest.kt

@@ -770,7 +770,7 @@ class DocumentTest : BaseDbTest() {
     fun testSetDate() {
         var mDoc = MutableDocument("doc1")
 
-        val date = Clock.System.now()
+        val date = Clock.System.nowMillis()
         val dateStr = date.toStringMillis()
         assertTrue(dateStr.isNotEmpty())
         mDoc.setValue("date", date)

couchbase-lite/src/commonTest/kotlin/kotbase/JSONTest.kt

@@ -15,6 +15,7 @@
  */
 package kotbase
 
+import kotbase.ext.nowMillis
 import kotlinx.datetime.Clock
 import kotlin.test.Test
 import kotlin.test.assertEquals
@@ -24,7 +25,7 @@ class JSONTest {
     // Verify that round trip String -> Date -> String doesn't alter the string (#1611)
     @Test
     fun testJSONDateRoundTrip() {
-        val now = Clock.System.now()
+        val now = Clock.System.nowMillis()
         // internally calls the relevant JSONUtils.toJSONString() and JSONUtils.toDate()
         val array = MutableArray()
         val dateStr = array.addDate(now).getString(0)

gradle/libs.versions.toml

@@ -29,8 +29,7 @@ kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test" }
 kotlin-test-junit = { module = "org.jetbrains.kotlin:kotlin-test-junit" }
 kotlinx-atomicfu = { module = "org.jetbrains.kotlinx:atomicfu", version = "0.25.0" }
 kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version = "1.9.0" }
-# kotlinx-datetime v0.6.0 introduces https://github.com/Kotlin/kotlinx-datetime/issues/439
-kotlinx-datetime = { module = "org.jetbrains.kotlinx:kotlinx-datetime", version = "0.5.0" }
+kotlinx-datetime = { module = "org.jetbrains.kotlinx:kotlinx-datetime", version = "0.6.1" }
 kotlinx-io = { module = "org.jetbrains.kotlinx:kotlinx-io-core", version = "0.5.4" }
 kotlinx-serialization-json = { module = "org.jetbrains.kotlinx:kotlinx-serialization-json", version.ref = "kotlinx-serialization" }
 mockk = { module = "io.mockk:mockk", version.ref = "mockk" }