Update dependency prettier to ^2.8.8 (main) (elastic#189123)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [prettier](https://prettier.io)
([source](https://togithub.com/prettier/prettier)) | [`^2.8.0` ->
`^2.8.8`](https://renovatebot.com/diffs/npm/prettier/2.8.8/2.8.8) |
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|
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|
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|
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package.json

@@ -1724,7 +1724,7 @@
     "postcss-loader": "^4.2.0",
     "postcss-prefix-selector": "^1.16.0",
     "postcss-scss": "^4.0.4",
-    "prettier": "^2.8.0",
+    "prettier": "^2.8.8",
     "proxy": "^2.1.1",
     "q": "^1.5.1",
     "raw-loader": "^3.1.0",

yarn.lock

@@ -25776,7 +25776,7 @@ prettier-linter-helpers@^1.0.0:
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.3.0.tgz#b6a5bf1284026ae640f17f7ff5658a7567fc0d18"
   integrity sha512-kXtO4s0Lz/DW/IJ9QdWhAf7/NmPWQXkFr/r/WkR3vyI+0v8amTDxiaQSLzs8NBlytfLWX/7uQUMIW677yLKl4w==
 
-prettier@^2.0.0, prettier@^2.8.0:
+prettier@^2.0.0, prettier@^2.8.8:
   version "2.8.8"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.8.8.tgz#e8c5d7e98a4305ffe3de2e1fc4aca1a71c28b1da"
   integrity sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==