build(deps-dev): bump postcss

Bumps the npm_and_yarn group in /apps/OpenSign with 1 update: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.4.38 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/8.4.38...8.4.39)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  dependency-group: npm_and_yarn
...

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

apps/OpenSign/package-lock.json

@@ -64,7 +64,7 @@
         "eslint-plugin-prettier": "^5.1.3",
         "eslint-plugin-react": "^7.34.3",
         "lint-staged": "^15.2.7",
-        "postcss": "^8.4.38",
+        "postcss": "^8.4.39",
         "prettier": "^3.3.2",
         "pretty-quick": "^4.0.0",
         "tailwindcss": "^3.4.4"
@@ -17511,9 +17511,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.4.38",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.38.tgz",
-      "integrity": "sha512-Wglpdk03BSfXkHoQa3b/oulrotAkwrlLDRSOb9D0bN86FdRyE9lppSp33aHNPgBa0JKCoB+drFLZkQoRRYae5A==",
+      "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",
@@ -17530,7 +17530,7 @@
       ],
       "dependencies": {
         "nanoid": "^3.3.7",
-        "picocolors": "^1.0.0",
+        "picocolors": "^1.0.1",
         "source-map-js": "^1.2.0"
       },
       "engines": {

apps/OpenSign/package.json

@@ -94,7 +94,7 @@
     "eslint-plugin-prettier": "^5.1.3",
     "eslint-plugin-react": "^7.34.3",
     "lint-staged": "^15.2.7",
-    "postcss": "^8.4.38",
+    "postcss": "^8.4.39",
     "prettier": "^3.3.2",
     "pretty-quick": "^4.0.0",
     "tailwindcss": "^3.4.4"