docs: upgrade Node.js to version 20

Node.js 20 is the current LTS release:
https://nodejs.org/en/about/releases/

BREAKING CHANGE: the minimum Node.js is 20

Author: coderbyheart

.github/workflows/api-tests.yaml

@@ -22,7 +22,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v4
         with:
-          node-version: "18.x"
+          node-version: "20.x"
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - run: npm ci
       - run: npx jest agps.spec.ts
@@ -32,7 +32,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v4
         with:
-          node-version: "18.x"
+          node-version: "20.x"
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - run: npm ci
       - run: npx jest pgps.spec.ts
@@ -42,7 +42,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v4
         with:
-          node-version: "18.x"
+          node-version: "20.x"
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - run: npm ci
       - run: npx jest ground-fix.spec.ts
@@ -52,7 +52,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v4
         with:
-          node-version: "18.x"
+          node-version: "20.x"
         if: env.EVALUATION_TOKEN != ''
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
         if: env.EVALUATION_TOKEN != ''
@@ -66,7 +66,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v4
         with:
-          node-version: "18.x"
+          node-version: "20.x"
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - run: npm ci
       - run: npx jest device-token-authentication.spec.ts

.github/workflows/code-style.yaml

@@ -21,7 +21,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: "18.x"
+          node-version: "20.x"
 
       - name: Keep npm cache around to speed up installs
         uses: actions/cache@v3

.github/workflows/npm-prerelease.yaml

@@ -17,7 +17,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         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

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - uses: actions/setup-node@v4
         with:
-          node-version: "18.x"
+          node-version: "20.x"
       - name: Keep npm cache around to speed up installs
         uses: actions/cache@v3
         with:

package.json

@@ -42,7 +42,7 @@
     ]
   },
   "engines": {
-    "node": ">=18",
+    "node": ">=20",
     "npm": ">=9"
   },
   "release": {