Bump postcss from 8.2.7 to 8.2.8 in /build/javascript (#806)

Bumps [postcss](https://github.com/postcss/postcss) from 8.2.7 to 8.2.8.
- [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/8.2.7...8.2.8)

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

build/javascript/package-lock.json

@@ -1805,9 +1805,9 @@
       }
     },
     "postcss": {
-      "version": "8.2.7",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.2.7.tgz",
-      "integrity": "sha512-DsVLH3xJzut+VT+rYr0mtvOtpTjSyqDwPf5EZWXcb0uAKfitGpTY9Ec+afi2+TgdN8rWS9Cs88UDYehKo/RvOw==",
+      "version": "8.2.8",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.2.8.tgz",
+      "integrity": "sha512-1F0Xb2T21xET7oQV9eKuctbM9S7BC0fetoHCc4H13z0PT6haiRLP4T0ZY4XWh7iLP0usgqykT6p9B2RtOf4FPw==",
       "dev": true,
       "requires": {
         "colorette": "^1.2.2",

build/javascript/package.json

@@ -16,7 +16,7 @@
   },
   "devDependencies": {
     "cssnano": "^4.1.10",
-    "postcss": "^8.2.7",
+    "postcss": "^8.2.8",
     "postcss-cli": "^8.3.1"
   },
   "snowpack": {