lock in autoprefixer, postcss, and postcss-flexbug-fixes

Author: gregrickaby

package-lock.json

@@ -45,7 +45,7 @@
     "@tailwindcss/postcss7-compat": "^2.0.3",
     "algoliasearch": "^4.8.5",
     "apollo-link-rest": "^0.8.0-beta.0",
-    "autoprefixer": "^9.8.6",
+    "autoprefixer": "9.8.6",
     "babel-loader": "^8.2.2",
     "chromatic": "^5.6.2",
     "dayjs": "^1.10.4",
@@ -64,8 +64,8 @@
     "hamburger-react": "^2.4.0",
     "next-seo": "^4.19.0",
     "next-sitemap": "^1.5.6",
-    "postcss": "^7.0.35",
-    "postcss-flexbugs-fixes": "^4.2.1",
+    "postcss": "7.0.35",
+    "postcss-flexbugs-fixes": "4.2.1",
     "postcss-preset-env": "^6.7.0",
     "prettier": "^2.2.1",
     "prop-types": "^15.7.2",