Upgrade to Node 20 (#143)

* Upgrade to Node 20

* Upgrade all dependencies

Author: connor-baer

.github/workflows/ci.yaml

@@ -9,10 +9,10 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
-      - name: Use Node.js v18
+      - name: Use Node.js v20
         uses: actions/setup-node@v3
         with:
-          node-version: 18.x
+          node-version: 20.x
           cache: 'npm'
       - name: Install dependencies
         run: npm ci

.nvmrc

@@ -1 +1 @@
-18
+lts/iron