Build: suppress wasm stability warning

To prevent it from being displayed when configuring
`:kotlin-stdlib-wasm` and ':kotlin-test:kotlin-test-wasm' on each build.

gradle.properties

@@ -31,10 +31,12 @@ kotlin.jvm.target.validation.mode=error
 # TODO: add this flag in a granular way to the modules that don't need stdlib?
 kotlin.stdlib.default.dependency=false
 
-# Suppress warnings about using deprecated and Alpha multiplatform plugins in kotlin-stdlib
+# Suppress warnings about using deprecated and unstable plugins in kotlin-stdlib
 kotlin.internal.mpp12x.deprecation.suppress=true
 kotlin.mpp.stability.nowarn=true
+kotlin.wasm.stability.nowarn=true
 kotlin.2js.nowarn=true
+
 kotlin.native.enabled=false
 kotlin.native.home=kotlin-native/dist