Bump postcss from 8.1.10 to 8.1.13

Bumps [postcss](https://github.com/postcss/postcss) from 8.1.10 to 8.1.13.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.1.10...8.1.13)

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

package-lock.json

@@ -8497,9 +8497,9 @@
             "dev": true
         },
         "nanoid": {
-            "version": "3.1.18",
-            "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.1.18.tgz",
-            "integrity": "sha512-rndlDjbbHbcV3xi+R2fpJ+PbGMdfBxz5v1fATIQFq0DP64FsicQdwnKLy47K4kZHdRpmQXtz24eGsxQqamzYTA==",
+            "version": "3.1.20",
+            "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.1.20.tgz",
+            "integrity": "sha512-a1cQNyczgKbLX9jwbS/+d7W8fX/RfgYR7lVWwWOGIPNgK2m0MWvrGF6/m4kk6U3QcFMnZf3RIhL0v2Jgh/0Uxw==",
             "dev": true
         },
         "nanomatch": {
@@ -9332,13 +9332,13 @@
             "dev": true
         },
         "postcss": {
-            "version": "8.1.10",
-            "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.1.10.tgz",
-            "integrity": "sha512-iBXEV5VTTYaRRdxiFYzTtuv2lGMQBExqkZKSzkJe+Fl6rvQrA/49UVGKqB+LG54hpW/TtDBMGds8j33GFNW7pg==",
+            "version": "8.1.13",
+            "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.1.13.tgz",
+            "integrity": "sha512-D++wck3XhQkICYfysZRx90JCDgaTTdq8YxLswB9cjBzfxwcVcQjn3LsjXon0PQ6TIOof2IGWLRHhSgXZuJct4w==",
             "dev": true,
             "requires": {
                 "colorette": "^1.2.1",
-                "nanoid": "^3.1.18",
+                "nanoid": "^3.1.20",
                 "source-map": "^0.6.1",
                 "vfile-location": "^3.2.0"
             },

package.json

@@ -66,7 +66,7 @@
         "gulp-terser": "^2.0.0",
         "gulp-zip": "^5.0.2",
         "merge-stream": "^2.0.0",
-        "postcss": "^8.1.10",
+        "postcss": "^8.1.13",
         "sass": "^1.29.0",
         "terser": "^5.5.1",
         "vinyl-buffer": "^1.0.1",