Bump postcss from 8.3.6 to 8.4.31 in /tgui (#16009)

Bumps [postcss](https://github.com/postcss/postcss) from 8.3.6 to 8.4.31.
- [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/8.3.6...8.4.31)

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

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

tgui/yarn.lock

@@ -5987,12 +5987,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"nanoid@npm:^3.1.23":
-  version: 3.3.4
-  resolution: "nanoid@npm:3.3.4"
+"nanoid@npm:^3.3.6":
+  version: 3.3.6
+  resolution: "nanoid@npm:3.3.6"
   bin:
     nanoid: bin/nanoid.cjs
-  checksum: 2fddd6dee994b7676f008d3ffa4ab16035a754f4bb586c61df5a22cf8c8c94017aadd360368f47d653829e0569a92b129979152ff97af23a558331e47e37cd9c
+  checksum: 7d0eda657002738aa5206107bd0580aead6c95c460ef1bdd0b1a87a9c7ae6277ac2e9b945306aaa5b32c6dcb7feaf462d0f552e7f8b5718abfc6ead5c94a71b3
   languageName: node
   linkType: hard
 
@@ -6440,6 +6440,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"picocolors@npm:^1.0.0":
+  version: 1.0.0
+  resolution: "picocolors@npm:1.0.0"
+  checksum: a2e8092dd86c8396bdba9f2b5481032848525b3dc295ce9b57896f931e63fc16f79805144321f72976383fc249584672a75cc18d6777c6b757603f372f745981
+  languageName: node
+  linkType: hard
+
 "picomatch@npm:^2.0.4, picomatch@npm:^2.2.1, picomatch@npm:^2.2.3":
   version: 2.3.0
   resolution: "picomatch@npm:2.3.0"
@@ -6529,13 +6536,13 @@ __metadata:
   linkType: hard
 
 "postcss@npm:^8.2.15":
-  version: 8.3.6
-  resolution: "postcss@npm:8.3.6"
+  version: 8.4.31
+  resolution: "postcss@npm:8.4.31"
   dependencies:
-    colorette: ^1.2.2
-    nanoid: ^3.1.23
-    source-map-js: ^0.6.2
-  checksum: ff55b91bea21f42c2a94d77fd05c3f66dd15889c68506cf1dbb9cdee8c3b9e9d0e219bcbc6e61a107bd63e3cac0670176486e2a5794c106a4e1b9babceb79317
+    nanoid: ^3.3.6
+    picocolors: ^1.0.0
+    source-map-js: ^1.0.2
+  checksum: 1d8611341b073143ad90486fcdfeab49edd243377b1f51834dc4f6d028e82ce5190e4f11bb2633276864503654fb7cab28e67abdc0fbf9d1f88cad4a0ff0beea
   languageName: node
   linkType: hard
 
@@ -7223,10 +7230,10 @@ resolve@^2.0.0-next.3:
   languageName: node
   linkType: hard
 
-"source-map-js@npm:^0.6.2":
-  version: 0.6.2
-  resolution: "source-map-js@npm:0.6.2"
-  checksum: 9c8151a29e00fd8d3ba87709fdf9a9ce48313d653f4a29a39b4ae53d346ac79e005de624796ff42eff55cbaf26d2e87f4466001ca87831d400d818c5cf146a0e
+"source-map-js@npm:^1.0.2":
+  version: 1.0.2
+  resolution: "source-map-js@npm:1.0.2"
+  checksum: c049a7fc4deb9a7e9b481ae3d424cc793cb4845daa690bc5a05d428bf41bf231ced49b4cf0c9e77f9d42fdb3d20d6187619fc586605f5eabe995a316da8d377c
   languageName: node
   linkType: hard