Bump postcss from 8.3.8 to 8.3.9 in /build/javascript (#1454)

Bumps [postcss](https://github.com/postcss/postcss) from 8.3.8 to 8.3.9.
- [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/8.3.8...8.3.9)

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

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

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

build/javascript/package-lock.json

@@ -1272,6 +1272,12 @@
       "integrity": "sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw==",
       "dev": true
     },
+    "picocolors": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-0.2.1.tgz",
+      "integrity": "sha512-cMlDqaLEqfSaW8Z7N5Jw+lyIW869EzT73/F5lhtY9cLGoVxSXznfgfXMO0Z5K0o0Q2TkTXq+0KFsdnSe3jDViA==",
+      "dev": true
+    },
     "picomatch": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.0.tgz",
@@ -1293,13 +1299,13 @@
       }
     },
     "postcss": {
-      "version": "8.3.8",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.3.8.tgz",
-      "integrity": "sha512-GT5bTjjZnwDifajzczOC+r3FI3Cu+PgPvrsjhQdRqa2kTJ4968/X9CUce9xttIB0xOs5c6xf0TCWZo/y9lF6bA==",
+      "version": "8.3.9",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.3.9.tgz",
+      "integrity": "sha512-f/ZFyAKh9Dnqytx5X62jgjhhzttjZS7hMsohcI7HEI5tjELX/HxCy3EFhsRxyzGvrzFF+82XPvCS8T9TFleVJw==",
       "dev": true,
       "requires": {
-        "nanocolors": "^0.2.2",
-        "nanoid": "^3.1.25",
+        "nanoid": "^3.1.28",
+        "picocolors": "^0.2.1",
         "source-map-js": "^0.6.2"
       }
     },

build/javascript/package.json

@@ -16,7 +16,7 @@
   },
   "devDependencies": {
     "cssnano": "^5.0.8",
-    "postcss": "^8.3.8",
+    "postcss": "^8.3.9",
     "postcss-cli": "^9.0.1"
   },
   "snowpack": {