chore(deps): bump postcss from 8.2.9 to 8.2.15 (#7383)

Bumps [postcss](https://github.com/postcss/postcss) from 8.2.9 to 8.2.15.
- [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/8.2.9...8.2.15)

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

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

package-lock.json

@@ -9406,12 +9406,6 @@
       "dev": true,
       "optional": true
     },
-    "nanoid": {
-      "version": "3.1.22",
-      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.1.22.tgz",
-      "integrity": "sha512-/2ZUaJX2ANuLtTvqTlgqBQNJoQO398KyJgZloL0PZkC0dpysjncRUPsFe3DUPzz/y3h+u7C46np8RMuvF3jsSQ==",
-      "dev": true
-    },
     "nanomatch": {
       "version": "1.2.13",
       "resolved": "https://registry.npmjs.org/nanomatch/-/nanomatch-1.2.13.tgz",
@@ -10309,16 +10303,22 @@
       "optional": true
     },
     "postcss": {
-      "version": "8.2.9",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.2.9.tgz",
-      "integrity": "sha512-b+TmuIL4jGtCHtoLi+G/PisuIl9avxs8IZMSmlABRwNz5RLUUACrC+ws81dcomz1nRezm5YPdXiMEzBEKgYn+Q==",
+      "version": "8.2.15",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.2.15.tgz",
+      "integrity": "sha512-2zO3b26eJD/8rb106Qu2o7Qgg52ND5HPjcyQiK2B98O388h43A448LCslC0dI2P97wCAQRJsFvwTRcXxTKds+Q==",
       "dev": true,
       "requires": {
         "colorette": "^1.2.2",
-        "nanoid": "^3.1.22",
+        "nanoid": "^3.1.23",
         "source-map": "^0.6.1"
       },
       "dependencies": {
+        "nanoid": {
+          "version": "3.1.23",
+          "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.1.23.tgz",
+          "integrity": "sha512-FiB0kzdP0FFVGDKlRLEQ1BgDzU87dy5NnzjeW9YZNt+/c3+q82EQDUwniSAUxp/F0gFNI1ZhKU1FqYsMuqZVnw==",
+          "dev": true
+        },
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",