Bump postcss from 8.1.7 to 8.1.8

Bumps [postcss](https://github.com/postcss/postcss) from 8.1.7 to 8.1.8.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.1.7...8.1.8)

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

package-lock.json

@@ -8421,9 +8421,9 @@
             "dev": true
         },
         "nanoid": {
-            "version": "3.1.16",
-            "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.1.16.tgz",
-            "integrity": "sha512-+AK8MN0WHji40lj8AEuwLOvLSbWYApQpre/aFJZD71r43wVRLrOYS4FmJOPQYon1TqB462RzrrxlfA74XRES8w==",
+            "version": "3.1.17",
+            "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.1.17.tgz",
+            "integrity": "sha512-5mmlQz73ohlISpARejqTwgYzh92wwBccatETsLOI+VKkY6Lx/Dj3wvG7tCoKjX+eEaZWn0gB7Xkfl5JatHQTeA==",
             "dev": true
         },
         "nanomatch": {
@@ -9256,9 +9256,9 @@
             "dev": true
         },
         "postcss": {
-            "version": "8.1.7",
-            "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.1.7.tgz",
-            "integrity": "sha512-llCQW1Pz4MOPwbZLmOddGM9eIJ8Bh7SZ2Oj5sxZva77uVaotYDsYTch1WBTNu7fUY0fpWp0fdt7uW40D4sRiiQ==",
+            "version": "8.1.8",
+            "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.1.8.tgz",
+            "integrity": "sha512-hO6jFWBy0QnBBRaw+s0F4hVPKGDICec/nLNEG1D4qqw9/LBzWMkTjckqqELXAo0J42jN8GFZXtgQfezEaoG9gQ==",
             "dev": true,
             "requires": {
                 "colorette": "^1.2.1",

package.json

@@ -66,7 +66,7 @@
         "gulp-terser": "^1.4.1",
         "gulp-zip": "^5.0.2",
         "merge-stream": "^2.0.0",
-        "postcss": "^8.1.7",
+        "postcss": "^8.1.8",
         "sass": "^1.29.0",
         "terser": "^5.5.0",
         "vinyl-buffer": "^1.0.1",