Mark settings updates as fire-and-forget

Preserve the existing asynchronous configuration-provider update behavior after CppSettings.update began returning its completion promise.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Colengms

Extension/src/LanguageServer/configurations.ts

@@ -687,9 +687,9 @@ export class CppProperties implements vscode.Disposable {
         if (!this.propertiesFile) {
             const settings: CppSettings = new CppSettings(this.rootUri);
             if (providerId) {
-                settings.update("default.configurationProvider", providerId);
+                void settings.update("default.configurationProvider", providerId);
             } else {
-                settings.update("default.configurationProvider", undefined); // delete the setting
+                void settings.update("default.configurationProvider", undefined); // delete the setting
             }
             const config: Configuration | undefined = this.CurrentConfiguration;
             if (config) {