Bump postcss from 8.3.11 to 8.4.1 in /build/javascript (#1557)

Bumps [postcss](https://github.com/postcss/postcss) from 8.3.11 to 8.4.1.
- [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/8.3.11...8.4.1)

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

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

@@ -1206,14 +1206,14 @@
       }
     },
     "postcss": {
-      "version": "8.3.11",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.3.11.tgz",
-      "integrity": "sha512-hCmlUAIlUiav8Xdqw3Io4LcpA1DOt7h3LSTAC4G6JGHFFaWzI6qvFt9oilvl8BmkbBRX1IhM90ZAmpk68zccQA==",
+      "version": "8.4.1",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.1.tgz",
+      "integrity": "sha512-WqLs/TTzXdG+/A4ZOOK9WDZiikrRaiA+eoEb/jz2DT9KUhMNHgP7yKPO8vwi62ZCsb703Gwb7BMZwDzI54Y2Ag==",
       "dev": true,
       "requires": {
         "nanoid": "^3.1.30",
         "picocolors": "^1.0.0",
-        "source-map-js": "^0.6.2"
+        "source-map-js": "^1.0.1"
       }
     },
     "postcss-calc": {
@@ -1829,9 +1829,9 @@
       "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
     },
     "source-map-js": {
-      "version": "0.6.2",
-      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-0.6.2.tgz",
-      "integrity": "sha512-/3GptzWzu0+0MBQFrDKzw/DvvMTUORvgY6k6jd/VS6iCR4RDTKWH6v6WPwQoUO8667uQEf9Oe38DxAYWY5F/Ug==",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.0.1.tgz",
+      "integrity": "sha512-4+TN2b3tqOCd/kaGRJ/sTYA0tR0mdXx26ipdolxcwtJVqEnqNYvlCAt1q3ypy4QMlYus+Zh34RNtYLoq2oQ4IA==",
       "dev": true
     },
     "stable": {

build/javascript/package.json

@@ -15,7 +15,7 @@
   },
   "devDependencies": {
     "cssnano": "^5.0.11",
-    "postcss": "^8.3.11",
+    "postcss": "^8.4.1",
     "postcss-cli": "^9.0.2"
   },
   "snowpack": {