chore(deps): update vitest to ^3.1.2 (#13447)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

packages/vant/package.json

@@ -61,7 +61,7 @@
     "@vant/icons": "workspace:*",
     "@vitejs/plugin-vue": "^5.2.3",
     "@vitejs/plugin-vue-jsx": "^4.1.2",
-    "@vitest/coverage-istanbul": "^3.0.9",
+    "@vitest/coverage-istanbul": "^3.1.2",
     "@vue/runtime-core": "^3.5.13",
     "@vue/test-utils": "^2.4.6",
     "csstype": "^3.1.3",
@@ -69,7 +69,7 @@
     "jsdom": "^25.0.1",
     "typescript": "^5.8.3",
     "vite": "^5.4.18",
-    "vitest": "^3.0.9",
+    "vitest": "^3.1.2",
     "vitest-canvas-mock": "^0.3.3",
     "vue": "^3.5.13",
     "vue-router": "^4.5.0"