chore: upgrade to node 20 lts (#436)

Author: nihalgonsalves

.devcontainer/Dockerfile

@@ -1 +1 @@
-FROM mcr.microsoft.com/vscode/devcontainers/javascript-node:0-18
+FROM mcr.microsoft.com/vscode/devcontainers/javascript-node:0-20

.github/workflows/build.yml

@@ -7,7 +7,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v3
         with:
-          node-version: 18
+          node-version: 20
           cache: yarn
       - run: yarn install --frozen-lockfile
       - run: yarn format:check

package.json

@@ -15,8 +15,8 @@
     "format:check": "prettier . --check"
   },
   "devDependencies": {
-    "@nihalgonsalves/esconfig": "^0.6.6",
-    "@types/node": "18",
+    "@nihalgonsalves/esconfig": "^0.6.7",
+    "@types/node": "20",
     "eslint": "^8.52.0",
     "prettier": "^3.0.3",
     "ts-node-dev": "^2.0.0",