build(deps): bump postcss from 8.4.14 to 8.4.39 in /frontend

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.14 to 8.4.39.
- [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/8.4.14...8.4.39)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
...

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

frontend/package-lock.json

@@ -19360,9 +19360,9 @@
       "devOptional": true
     },
     "node_modules/picocolors": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.0.0.tgz",
-      "integrity": "sha512-1fygroTLlHu66zi26VoTDv8yRgm0Fccecssto+MhsZ0D/DGW2sm8E8AjW7NU5VVTRt5GxbeZ5qBuJr+HyLYkjQ=="
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.0.1.tgz",
+      "integrity": "sha512-anP1Z8qwhkbmu7MFP5iTt+wQKXgwzf7zTyGlcdzabySa9vd0Xt392U0rVmz9poOaBj0uHJKyyo9/upk0HrEQew=="
     },
     "node_modules/picomatch": {
       "version": "2.3.1",
@@ -19441,9 +19441,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.4.33",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.33.tgz",
-      "integrity": "sha512-Kkpbhhdjw2qQs2O2DGX+8m5OVqEcbB9HRBvuYM9pgrjEFUg30A9LmXNlTAUj4S9kgtGyrMbTzVjH7E+s5Re2yg==",
+      "version": "8.4.39",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.39.tgz",
+      "integrity": "sha512-0vzE+lAiG7hZl1/9I8yzKLx3aR9Xbof3fBHKunvMfOCYAtMhrsnccJY2iTURb9EZd5+pLuiNV9/c/GZJOHsgIw==",
       "funding": [
         {
           "type": "opencollective",
@@ -19460,8 +19460,8 @@
       ],
       "dependencies": {
         "nanoid": "^3.3.7",
-        "picocolors": "^1.0.0",
-        "source-map-js": "^1.0.2"
+        "picocolors": "^1.0.1",
+        "source-map-js": "^1.2.0"
       },
       "engines": {
         "node": "^10 || ^12 || >=14"
@@ -22254,9 +22254,9 @@
       }
     },
     "node_modules/source-map-js": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.0.2.tgz",
-      "integrity": "sha512-R0XvVJ9WusLiqTCEiGCmICCMplcCkIwwR11mOSD9CR5u+IXYdiseeEuXCVAjS54zqwkLcPNnmU4OeJ6tUrWhDw==",
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.0.tgz",
+      "integrity": "sha512-itJW8lvSA0TXEphiRoawsCksnlf8SyvmFzIhltqAHluXd88pkCd+cXJVHTDwdCr0IzwptSm035IHQktUu1QUMg==",
       "engines": {
         "node": ">=0.10.0"
       }