[api] Advance supported_import_assertions to V8_DEPRECATED.

Advance v8::Isolate::CreateParams::supported_import_assertions from
V8_DEPRECATE_SOON to V8_DEPRECATED now that Blink has stopped
setting it.

Bug: v8:10958
Change-Id: I502f08c0c2e424f3afae3a6cb11835376a847bcb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2656936Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Dan Clark <daniec@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#72436}

include/v8.h

@@ -8479,7 +8479,7 @@ class V8_EXPORT Isolate {
      */
     std::shared_ptr<CppHeapCreateParams> cpp_heap_params;
 
-    V8_DEPRECATE_SOON(
+    V8_DEPRECATED(
         "Setting this has no effect. Embedders should ignore import assertions "
         "that they do not use.")
     std::vector<std::string> supported_import_assertions;