[dev-tool] update vitest dependency version to resolve rush update failure (Azure#32597)

fixes
https://dev.azure.com/azure-sdk/internal/_build/results?buildId=4484318&view=logs&j=47092895-c7c8-567a-c7a6-8c88f3ec178e&t=d293a8e8-c6af-5091-cdf7-4c66482dd6f2&l=2173

Author: kazrael2119

common/tools/dev-tool/src/commands/admin/migrate-package.ts

@@ -418,6 +418,11 @@ async function addNewPackages(packageJson: any, options: { browser: boolean }):
     packageJson.devDependencies[newPackage] = `^${latestVersion.replace("\n", "")}`;
   }
 
+  packageJson.devDependencies["vitest"] = "^2.1.8";
+  packageJson.devDependencies["@vitest/coverage-istanbul"] = "^2.1.8";
+  if (options.browser) {
+    packageJson.devDependencies["@vitest/browser"] = "^2.1.8";
+  }
   const packagesToUpdate = [
     { package: "@azure-tools/test-credential", version: "^2.0.0" },
     { package: "@azure-tools/test-recorder", version: "^4.1.0" },