Bump postcss from 8.4.41 to 8.4.45 in /frontend-react (#15782)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.41 to 8.4.45.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.41...8.4.45)

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

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

frontend-react/package.json

@@ -176,7 +176,7 @@
     "npm-run-all": "^4.1.5",
     "otpauth": "^9.3.2",
     "patch-package": "^8.0.0",
-    "postcss": "^8.4.41",
+    "postcss": "^8.4.45",
     "prettier": "^3.3.3",
     "react-error-boundary": "^4.0.13",
     "remark-frontmatter": "^5.0.0",

frontend-react/yarn.lock

@@ -11759,14 +11759,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.4.41":
-  version: 8.4.41
-  resolution: "postcss@npm:8.4.41"
+"postcss@npm:^8.4.45":
+  version: 8.4.45
+  resolution: "postcss@npm:8.4.45"
   dependencies:
     nanoid: ^3.3.7
     picocolors: ^1.0.1
     source-map-js: ^1.2.0
-  checksum: f865894929eb0f7fc2263811cc853c13b1c75103028b3f4f26df777e27b201f1abe21cb4aa4c2e901c80a04f6fb325ee22979688fe55a70e2ea82b0a517d3b6f
+  checksum: 3223cdad4a9392c0b334ee3ee7e4e8041c631cb6160609cef83c18d2b2580e931dd8068ab13cc6000c1a254d57492ac6c38717efc397c5dcc9756d06bc9c44f3
   languageName: node
   linkType: hard
 
@@ -12141,7 +12141,7 @@ __metadata:
     npm-run-all: ^4.1.5
     otpauth: ^9.3.2
     patch-package: ^8.0.0
-    postcss: ^8.4.41
+    postcss: ^8.4.45
     prettier: ^3.3.3
     react: ^18.3.1
     react-dom: ^18.3.1