Bump postcss from 8.4.40 to 8.4.47 in /frontend

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.40 to 8.4.47.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.40...8.4.47)

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

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

frontend/package.json

@@ -98,7 +98,7 @@
     "eslint-plugin-prettier": "^5.2.1",
     "msw": "^2.4.9",
     "orval": "^7.1.1",
-    "postcss": "^8.4.40",
+    "postcss": "^8.4.47",
     "prettier": "^3.3.3",
     "prettier-plugin-tailwindcss": "^0.6.8",
     "redis": "^4.7.0",

frontend/yarn.lock

@@ -10819,7 +10819,7 @@ __metadata:
     next-sitemap: "npm:^4.2.3"
     next-themes: "npm:^0.3.0"
     orval: "npm:^7.1.1"
-    postcss: "npm:^8.4.40"
+    postcss: "npm:^8.4.47"
     prettier: "npm:^3.3.3"
     prettier-plugin-tailwindcss: "npm:^0.6.8"
     react: "npm:^18.3.1"
@@ -14357,6 +14357,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"picocolors@npm:^1.1.0":
+  version: 1.1.1
+  resolution: "picocolors@npm:1.1.1"
+  checksum: 10c0/e2e3e8170ab9d7c7421969adaa7e1b31434f789afb9b3f115f6b96d91945041ac3ceb02e9ec6fe6510ff036bcc0bf91e69a1772edc0b707e12b19c0f2d6bcf58
+  languageName: node
+  linkType: hard
+
 "picomatch@npm:^2.0.4, picomatch@npm:^2.2.1, picomatch@npm:^2.2.3, picomatch@npm:^2.3.1":
   version: 2.3.1
   resolution: "picomatch@npm:2.3.1"
@@ -14594,14 +14601,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.4.40":
-  version: 8.4.40
-  resolution: "postcss@npm:8.4.40"
+"postcss@npm:^8.4.47":
+  version: 8.4.47
+  resolution: "postcss@npm:8.4.47"
   dependencies:
     nanoid: "npm:^3.3.7"
-    picocolors: "npm:^1.0.1"
-    source-map-js: "npm:^1.2.0"
-  checksum: 10c0/65ed67573e5443beaeb582282ff27a6be7c7fe3b4d9fa15761157616f2b97510cb1c335023c26220b005909f007337026d6e3ff092f25010b484ad484e80ea7f
+    picocolors: "npm:^1.1.0"
+    source-map-js: "npm:^1.2.1"
+  checksum: 10c0/929f68b5081b7202709456532cee2a145c1843d391508c5a09de2517e8c4791638f71dd63b1898dba6712f8839d7a6da046c72a5e44c162e908f5911f57b5f44
   languageName: node
   linkType: hard
 
@@ -16191,7 +16198,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"source-map-js@npm:>=0.6.2 <2.0.0, source-map-js@npm:^1.0.2":
+"source-map-js@npm:>=0.6.2 <2.0.0, source-map-js@npm:^1.0.2, source-map-js@npm:^1.2.1":
   version: 1.2.1
   resolution: "source-map-js@npm:1.2.1"
   checksum: 10c0/7bda1fc4c197e3c6ff17de1b8b2c20e60af81b63a52cb32ec5a5d67a20a7d42651e2cb34ebe93833c5a2a084377e17455854fee3e21e7925c64a51b6a52b0faf