test: update integration test dependencies

Update integration test deps to latest releases which
drop Node 10 and 12 support.

Author: ludofischer

package.json

@@ -17,7 +17,7 @@
     "./packages/*"
   ],
   "engines": {
-    "node": "^10 || ^12 || >=14"
+    "node": "^14 || ^16 || >=18"
   },
   "devDependencies": {
     "@changesets/cli": "^2.26.0",
@@ -31,8 +31,6 @@
     "pleeease-filters": "^4.0.0",
     "postcss": "^8.4.21",
     "postcss-font-magician": "^3.0.0",
-    "postcss-scss": "^3.0.4",
-    "postcss-simple-vars": "^6.0.1",
     "postcss-value-parser": "^4.2.0",
     "prettier": "^2.8.4",
     "typescript": "^4.8.4",

packages/postcss-discard-comments/package.json

@@ -30,7 +30,9 @@
     "node": "^14 || ^16 || >=18.0"
   },
   "devDependencies": {
-    "postcss": "^8.2.15"
+    "postcss": "^8.2.15",
+    "postcss-simple-vars": "^7.0.1",
+    "postcss-scss": "^4.0.6"
   },
   "peerDependencies": {
     "postcss": "^8.2.15"

packages/postcss-merge-rules/package.json

@@ -38,6 +38,7 @@
   "devDependencies": {
     "@types/caniuse-api": "^3.0.2",
     "postcss": "^8.2.15",
+    "postcss-simple-vars": "^7.0.1",
     "postcss-discard-comments": "workspace:^"
   },
   "peerDependencies": {