fix(ci): appease oxlint in vitest configs

vitest.unit.config.ts

@@ -1,6 +1,7 @@
 import { defineConfig } from "vitest/config";
 import baseConfig from "./vitest.config.ts";
 
+const base = baseConfig as unknown as Record<string, unknown>;
 const baseTest = (baseConfig as { test?: { include?: string[]; exclude?: string[] } }).test ?? {};
 const include = (
   baseTest.include ?? ["src/**/*.test.ts", "extensions/**/*.test.ts", "test/format-error.test.ts"]
@@ -8,7 +9,7 @@ const include = (
 const exclude = baseTest.exclude ?? [];
 
 export default defineConfig({
-  ...baseConfig,
+  ...base,
   test: {
     ...baseTest,
     include,