Bump postcss-discard-comments from 7.0.3 to 7.0.4

Bumps [postcss-discard-comments](https://github.com/cssnano/cssnano) from 7.0.3 to 7.0.4.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/postcss-discard-comments@7.0.3...postcss-discard-comments@7.0.4)

---
updated-dependencies:
- dependency-name: postcss-discard-comments
  dependency-version: 7.0.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -24,7 +24,7 @@
     "postcss-cli": "^11.0.1",
     "postcss-custom-media": "^11.0.5",
     "postcss-custom-selectors": "^8.0.4",
-    "postcss-discard-comments": "^7.0.2",
+    "postcss-discard-comments": "^7.0.4",
     "postcss-each": "^1.1.0",
     "postcss-easy-import": "^4.0.0",
     "postcss-mixins": "^11.0.3",