Bump postcss from 8.3.0 to 8.4.31 in /src/ui (#1727)

Summary: Bumps [postcss](https://github.com/postcss/postcss) from 8.3.0
to 8.4.31.

Relevant Issues: CVE-2023-44270

Type of change: /kind cve

Test Plan: Existing build and tests

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

src/ui/yarn.lock

@@ -5569,13 +5569,6 @@ __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"
@@ -11357,12 +11350,12 @@ __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: 3.3.7
+  resolution: "nanoid@npm:3.3.7"
   bin:
     nanoid: bin/nanoid.cjs
-  checksum: 4ef0969e1bbe866fc223eb32276cbccb0961900bfe79104fa5abe34361979dead8d0e061410a5c03bc3d47455685adf32c09d6f27790f4a6898fb51f7df7ec86
+  checksum: d36c427e530713e4ac6567d488b489a36582ef89da1d6d4e3b87eded11eb10d7042a877958c6f104929809b2ab0bafa17652b076cdf84324aa75b30b722204f2
   languageName: node
   linkType: hard
 
@@ -12327,13 +12320,13 @@ __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
 
@@ -13947,10 +13940,10 @@ __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