Bump clean-css-cli from 5.2.0 to 5.2.1 (#3484)

Bumps [clean-css-cli](https://github.com/jakubpawlowicz/clean-css-cli) from 5.2.0 to 5.2.1.
- [Release notes](https://github.com/jakubpawlowicz/clean-css-cli/releases)
- [Changelog](https://github.com/jakubpawlowicz/clean-css-cli/blob/master/History.md)
- [Commits](https://github.com/jakubpawlowicz/clean-css-cli/commits)

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

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

package-lock.json

@@ -2828,21 +2828,21 @@
       }
     },
     "clean-css": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.1.0.tgz",
-      "integrity": "sha512-98ALLW4NOhZpvUEoSc2dJO23xE4S4SXc4mLieCVFGo8DNLTFQ3gzi7msW1lqSYJeGZSF5r5+W3KF6cEnkILnFQ==",
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.1.1.tgz",
+      "integrity": "sha512-GQ6HdEyJN0543mRTA/TkZ7RPoMXGWKq1shs9H86F2kLuixR0RI+xd4JfhJxWUW08FGKQXTKAKpVjKQXu5zkFNA==",
       "dev": true,
       "requires": {
         "source-map": "~0.6.0"
       }
     },
     "clean-css-cli": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/clean-css-cli/-/clean-css-cli-5.2.0.tgz",
-      "integrity": "sha512-c7TQ+Lq8azYtThXtWlf0m9Iw66wBLQ0LPUJIEKHWTn8HB2tQlbqY6BMoKdgW4NJVZOYquwQrrRszTqH8NjHgTg==",
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/clean-css-cli/-/clean-css-cli-5.2.1.tgz",
+      "integrity": "sha512-y+nSP8lcBWXWHqBVK1o1UQjUR/s1Xu3H7rSXtp4R03orU8gGCkmYZjwhALMww6E6JChjoshpLodV+VfjAufaHw==",
       "dev": true,
       "requires": {
-        "clean-css": "^5.1.0",
+        "clean-css": "^5.1.1",
         "commander": "7.x",
         "glob": "^7.1.6"
       },

package.json

@@ -133,7 +133,7 @@
     "autoprefixer": "^10.2.4",
     "browser-sync": "^2.26.14",
     "bundlewatch": "^0.3.2",
-    "clean-css-cli": "^5.2.0",
+    "clean-css-cli": "^5.2.1",
     "concurrently": "^6.0.0",
     "eslint": "^7.21.0",
     "eslint-config-xo": "^0.35.0",