Bump nouislider in /src/OrchardCore.Themes/TheAdmin

Bumps [nouislider](https://github.com/leongersen/noUiSlider) from 15.7.0 to 15.8.1.
- [Release notes](https://github.com/leongersen/noUiSlider/releases)
- [Changelog](https://github.com/leongersen/noUiSlider/blob/master/CHANGELOG.MD)
- [Commits](leongersen/noUiSlider@15.7.0...15.8.1)

---
updated-dependencies:
- dependency-name: nouislider
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/OrchardCore.Themes/TheAdmin/package.json

@@ -5,6 +5,6 @@
     "@popperjs/core": "2.11.8",
     "bootstrap": "5.3.3",
     "bootstrap-select": "1.14.0-beta3",
-    "nouislider": "15.7.0"
+    "nouislider": "15.8.1"
   }
 }