Bump the npm group in /src/sphinx_antsibull_ext/css with 2 updates (#427)

Bumps the npm group in /src/sphinx_antsibull_ext/css with 2 updates: [cssnano](https://github.com/cssnano/cssnano) and [sass](https://github.com/sass/dart-sass).


Updates `cssnano` from 7.1.1 to 7.1.2
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano@7.1.1...cssnano@7.1.2)

Updates `sass` from 1.93.2 to 1.93.3
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/main/CHANGELOG.md)
- [Commits](sass/dart-sass@1.93.2...1.93.3)

---
updated-dependencies:
- dependency-name: cssnano
  dependency-version: 7.1.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm
- dependency-name: sass
  dependency-version: 1.93.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/sphinx_antsibull_ext/css/package-lock.json

@@ -1,9 +1,9 @@
 {
   "dependencies": {
     "autoprefixer": "^10.4.21",
-    "cssnano": "^7.1.1",
+    "cssnano": "^7.1.2",
     "postcss": "^8.5.6",
     "postcss-cli": "^11.0.1",
-    "sass": "^1.93.2"
+    "sass": "^1.93.3"
   }
 }