build: bump postcss from 8.2.6 to 8.2.8 (#22170)

Bumps [postcss](https://github.com/postcss/postcss) from 8.2.6 to 8.2.8.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.2.6...8.2.8)

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

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

Author: dependabot[bot]

yarn.lock

@@ -3904,10 +3904,10 @@ [email protected]:
     color-convert "^1.9.1"
     color-string "^1.5.2"
 
-colorette@^1.2.1:
-  version "1.2.1"
-  resolved "https://registry.yarnpkg.com/colorette/-/colorette-1.2.1.tgz#4d0b921325c14faf92633086a536db6e89564b1b"
-  integrity sha512-puCDz0CzydiSYOrnXpz/PKd69zRrribezjtE9yd4zvytoRc8+RY/KJPvtPFKZS3E3wP6neGyMe0vOTlHO5L3Pw==
+colorette@^1.2.1, colorette@^1.2.2:
+  version "1.2.2"
+  resolved "https://registry.yarnpkg.com/colorette/-/colorette-1.2.2.tgz#cbcc79d5e99caea2dbf10eb3a26fd8b3e6acfa94"
+  integrity sha512-MKGMzyfeuutC/ZJ1cba9NqcNpfeqMUcYmyF1ZFY6/Cn7CNSAKx6a+s48sqLqyAiZuaP2TcqMhoo+dlwFnVxT9w==
 
 [email protected], [email protected]:
   version "1.0.3"
@@ -10414,11 +10414,11 @@ postcss@^5.2.16:
     supports-color "^3.2.3"
 
 postcss@^8.1.7, postcss@^8.2.1:
-  version "8.2.6"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.6.tgz#5d69a974543b45f87e464bc4c3e392a97d6be9fe"
-  integrity sha512-xpB8qYxgPuly166AGlpRjUdEYtmOWx2iCwGmrv4vqZL9YPVviDVPZPRXxnXr6xPZOdxQ9lp3ZBFCRgWJ7LE3Sg==
+  version "8.2.8"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.8.tgz#0b90f9382efda424c4f0f69a2ead6f6830d08ece"
+  integrity sha512-1F0Xb2T21xET7oQV9eKuctbM9S7BC0fetoHCc4H13z0PT6haiRLP4T0ZY4XWh7iLP0usgqykT6p9B2RtOf4FPw==
   dependencies:
-    colorette "^1.2.1"
+    colorette "^1.2.2"
     nanoid "^3.1.20"
     source-map "^0.6.1"