Do not print stdlib version substitution message if nothing changed

prepare/build.version/build.gradle.kts

@@ -30,21 +30,25 @@ val writeStdlibVersion by tasks.registering {
     inputs.property("version", kotlinVersionLocal)
     outputs.file(versionFile)
 
-    fun replaceVersion(versionFile: File, versionPattern: String, replacement: (MatchResult) -> String) {
+    fun Task.replaceVersion(versionFile: File, versionPattern: String, replacement: (MatchResult) -> String) {
         check(versionFile.isFile) { "Version file $versionFile is not found" }
         val text = versionFile.readText()
         val pattern = Regex(versionPattern)
         val match = pattern.find(text) ?: error("Version pattern is missing in file $versionFile")
+        val group = match.groups[1]!!
         val newValue = replacement(match)
-        versionFile.writeText(text.replaceRange(match.groups[1]!!.range, newValue))
+        if (newValue != group.value) {
+            logger.lifecycle("Writing new standard library version components: $newValue (was: ${group.value})")
+            versionFile.writeText(text.replaceRange(group.range, newValue))
+        } else {
+            logger.info("Standard library version components: ${group.value}")
+        }
     }
 
     doLast {
         replaceVersion(versionFile, """fun get\(\): KotlinVersion = KotlinVersion\((\d+, \d+, \d+)\)""") {
             val (major, minor, _, optPatch) = Regex("""^(\d+)\.(\d+)(\.(\d+))?""").find(kotlinVersionLocal)?.destructured ?: error("Cannot parse current version $kotlinVersionLocal")
-            val newVersion = "$major, $minor, ${optPatch.takeIf { it.isNotEmpty() } ?: "0" }"
-            logger.lifecycle("Writing new standard library version components: $newVersion")
-            newVersion
+            "$major, $minor, ${optPatch.takeIf { it.isNotEmpty() } ?: "0" }"
         }
     }
 }