Update dependency autoprefixer to v9.8.8

This MR contains the following updates:

Package	Type	Update	Change
autoprefixer	devDependencies	patch	9.8.6 -> 9.8.8

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Release Notes

postcss/autoprefixer

v9.8.8

Compare Source

• Replaced nanocolors with picocolors.
• Reduced package size.

v9.8.7

Compare Source

• Replaced colorette with nanocolors.
• Reduced package size.

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Configuration

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package.json

@@ -67,7 +67,7 @@
     "@vue/babel-helper-vue-jsx-merge-props": "1.4.0",
     "@vue/babel-preset-jsx": "1.4.0",
     "@vue/test-utils": "1.3.0",
-    "autoprefixer": "9.8.6",
+    "autoprefixer": "9.8.8",
     "babel-eslint": "8.2.6",
     "babel-helper-vue-jsx-merge-props": "2.0.3",
     "babel-jest": "25.5.1",