build(deps-dev): bump vitest and @vitest/coverage-istanbul

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) and [@vitest/coverage-istanbul](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-istanbul). These dependencies needed to be updated together.

Updates `vitest` from 4.0.3 to 4.0.8
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.0.8/packages/vitest)

Updates `@vitest/coverage-istanbul` from 4.0.3 to 4.0.8
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.0.8/packages/coverage-istanbul)

---
updated-dependencies:
- dependency-name: vitest
  dependency-version: 4.0.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: "@vitest/coverage-istanbul"
  dependency-version: 4.0.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -161,7 +161,7 @@
     "@rollup/plugin-terser": "^0.4.4",
     "@rollup/pluginutils": "^5.1.4",
     "@vitest/browser-webdriverio": "^4.0.3",
-    "@vitest/coverage-istanbul": "4.0.3",
+    "@vitest/coverage-istanbul": "4.0.8",
     "@wasm-tool/rollup-plugin-rust": "^3.0.5",
     "changesets-github-release": "^0.1.0",
     "fast-check": "^4.1.1",
@@ -172,7 +172,7 @@
     "typescript": "^5.9.3",
     "vite": "^7.1.12",
     "vite-plugin-dts": "^4.5.4",
-    "vitest": "4.0.3",
+    "vitest": "4.0.8",
     "wasm-pack": "^0.13.1",
     "webdriverio": "^9.20.0"
   },