Bump postcss from 8.4.45 to 8.4.47 in /frontend-react (#15882)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.45 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@8.4.45...8.4.47)

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

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

frontend-react/package.json

@@ -177,7 +177,7 @@
     "npm-run-all": "^4.1.5",
     "otpauth": "^9.3.2",
     "patch-package": "^8.0.0",
-    "postcss": "^8.4.45",
+    "postcss": "^8.4.47",
     "prettier": "^3.3.3",
     "react-error-boundary": "^4.1.2",
     "remark-frontmatter": "^5.0.0",

frontend-react/yarn.lock

@@ -11953,7 +11953,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.3.11, postcss@npm:^8.4.43, postcss@npm:^8.4.45":
+"postcss@npm:^8.3.11, postcss@npm:^8.4.43":
   version: 8.4.45
   resolution: "postcss@npm:8.4.45"
   dependencies:
@@ -11964,6 +11964,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"postcss@npm:^8.4.47":
+  version: 8.4.47
+  resolution: "postcss@npm:8.4.47"
+  dependencies:
+    nanoid: ^3.3.7
+    picocolors: ^1.1.0
+    source-map-js: ^1.2.1
+  checksum: f78440a9d8f97431dd2ab1ab8e1de64f12f3eff38a3d8d4a33919b96c381046a314658d2de213a5fa5eb296b656de76a3ec269fdea27f16d5ab465b916a0f52c
+  languageName: node
+  linkType: hard
+
 "prelude-ls@npm:^1.2.1":
   version: 1.2.1
   resolution: "prelude-ls@npm:1.2.1"
@@ -12336,7 +12347,7 @@ __metadata:
     otpauth: ^9.3.2
     p-limit: ^6.1.0
     patch-package: ^8.0.0
-    postcss: ^8.4.45
+    postcss: ^8.4.47
     prettier: ^3.3.3
     react: ^18.3.1
     react-dom: ^18.3.1
@@ -13514,6 +13525,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"source-map-js@npm:^1.2.1":
+  version: 1.2.1
+  resolution: "source-map-js@npm:1.2.1"
+  checksum: 4eb0cd997cdf228bc253bcaff9340afeb706176e64868ecd20efbe6efea931465f43955612346d6b7318789e5265bdc419bc7669c1cebe3db0eb255f57efa76b
+  languageName: node
+  linkType: hard
+
 "source-map-support@npm:^0.5.16":
   version: 0.5.21
   resolution: "source-map-support@npm:0.5.21"