Bump postcss from 8.3.0 to 8.4.31 in /src/ui

Bumps [postcss](https://github.com/postcss/postcss) from 8.3.0 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.3.0...8.4.31)

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

Signed-off-by: dependabot[bot] <[email protected]>

src/ui/yarn.lock

@@ -5445,13 +5445,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"colorette@npm:^1.2.2":
-  version: 1.2.2
-  resolution: "colorette@npm:1.2.2"
-  checksum: 69fec14ddaedd0f5b00e4bae40dc4bc61f7050ebdc82983a595d6fd64e650b9dc3c033fff378775683138e992e0ddd8717ac7c7cec4d089679dcfbe3cd921b04
-  languageName: node
-  linkType: hard
-
 "colorette@npm:^2.0.10, colorette@npm:^2.0.14, colorette@npm:^2.0.16":
   version: 2.0.16
   resolution: "colorette@npm:2.0.16"
@@ -11233,12 +11226,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"nanoid@npm:^3.1.23":
-  version: 3.3.1
-  resolution: "nanoid@npm:3.3.1"
+"nanoid@npm:^3.3.6":
+  version: 3.3.6
+  resolution: "nanoid@npm:3.3.6"
   bin:
     nanoid: bin/nanoid.cjs
-  checksum: 4ef0969e1bbe866fc223eb32276cbccb0961900bfe79104fa5abe34361979dead8d0e061410a5c03bc3d47455685adf32c09d6f27790f4a6898fb51f7df7ec86
+  checksum: 7d0eda657002738aa5206107bd0580aead6c95c460ef1bdd0b1a87a9c7ae6277ac2e9b945306aaa5b32c6dcb7feaf462d0f552e7f8b5718abfc6ead5c94a71b3
   languageName: node
   linkType: hard
 
@@ -12203,13 +12196,13 @@ __metadata:
   linkType: hard
 
 "postcss@npm:^8.2.15":
-  version: 8.3.0
-  resolution: "postcss@npm:8.3.0"
+  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: 7786df62a605e6fc9380c1ee1e5ed177fbcdb3f3427ac6096ee0dbd9d80bdb8627d2e528d38d6f0fe850bb5668d4d46923eaf65dfd146e9b51fe770bf140d0ef
+    nanoid: ^3.3.6
+    picocolors: ^1.0.0
+    source-map-js: ^1.0.2
+  checksum: 1d8611341b073143ad90486fcdfeab49edd243377b1f51834dc4f6d028e82ce5190e4f11bb2633276864503654fb7cab28e67abdc0fbf9d1f88cad4a0ff0beea
   languageName: node
   linkType: hard
 
@@ -13823,10 +13816,10 @@ __metadata:
   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