fix: switch to Node.js 20

Node.js 20 is going to be LTS release in October.
See https://github.com/nodejs/release

BREAKING CHANGE: this changes the required Node.js version to 20

Author: coderbyheart

.github/workflows/code-style.yaml

@@ -21,7 +21,7 @@ jobs:
 
       - uses: actions/setup-node@v3
         with:
-          node-version: "18.x"
+          node-version: "20.x"
 
       - name: Keep npm cache around to speed up installs
         uses: actions/cache@v3

.github/workflows/deploy.yaml

@@ -27,7 +27,7 @@ jobs:
 
       - uses: actions/setup-node@v3
         with:
-          node-version: "18.x"
+          node-version: "20.x"
 
       - name: Keep npm cache around to speed up installs
         uses: actions/cache@v3

.github/workflows/test-and-release.yaml

@@ -31,7 +31,7 @@ jobs:
 
       - uses: actions/setup-node@v3
         with:
-          node-version: "18.x"
+          node-version: "20.x"
 
       - name: Keep npm cache around to speed up installs
         uses: actions/cache@v3
@@ -118,7 +118,7 @@ jobs:
 
       - uses: actions/setup-node@v3
         with:
-          node-version: "18.x"
+          node-version: "20.x"
 
       - name: Keep npm cache around to speed up installs
         uses: actions/cache@v3

package.json

@@ -94,7 +94,7 @@
     ]
   },
   "engines": {
-    "node": ">=18",
+    "node": ">=20",
     "npm": ">=9"
   },
   "release": {