Bump rollup-plugin-istanbul from 4.0.0 to 5.0.0

Bumps [rollup-plugin-istanbul](https://github.com/artberri/rollup-plugin-istanbul) from 4.0.0 to 5.0.0.
- [Release notes](https://github.com/artberri/rollup-plugin-istanbul/releases)
- [Changelog](https://github.com/artberri/rollup-plugin-istanbul/blob/main/CHANGELOG.md)
- [Commits](artberri/rollup-plugin-istanbul@v4.0.0...v5.0.0)

---
updated-dependencies:
- dependency-name: rollup-plugin-istanbul
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -63,7 +63,7 @@
     "karma-sinon-chai": "^2.0.2",
     "mocha": "^10.2.0",
     "rollup": "^3.22.0",
-    "rollup-plugin-istanbul": "^4.0.0",
+    "rollup-plugin-istanbul": "^5.0.0",
     "sass": "^1.62.1",
     "sinon": "^16.0.0",
     "sinon-chai": "^3.7.0"