chore(deps): update dependency postcss to v8.5.5

yarn.lock

@@ -3875,7 +3875,7 @@ __metadata:
     next: "npm:15.3.3"
     next-auth: "npm:^5.0.0-beta.25"
     next-themes: "npm:^0.4.6"
-    postcss: "npm:8.5.4"
+    postcss: "npm:8.5.5"
     prettier: "npm:3.5.3"
     prisma: "npm:6.9.0"
     react: "npm:^19.0.0"
@@ -4280,7 +4280,18 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:8.5.4, postcss@npm:^8.4.41":
+"postcss@npm:8.5.5":
+  version: 8.5.5
+  resolution: "postcss@npm:8.5.5"
+  dependencies:
+    nanoid: "npm:^3.3.11"
+    picocolors: "npm:^1.1.1"
+    source-map-js: "npm:^1.2.1"
+  checksum: 10c0/6415873fab84de05c2d8fd18f72ea6654bca437bb4b9f02ca819c438501e4b3a450023e575e17587c6eaa5bedddaaa4dad3af210f5cf166e30cec09cac58baf8
+  languageName: node
+  linkType: hard
+
+"postcss@npm:^8.4.41":
   version: 8.5.4
   resolution: "postcss@npm:8.5.4"
   dependencies: