bump Node.js to 20.x (adoptium#2098)

Author: gdams

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
 
       - uses: actions/setup-node@bea5baf987ba7aa777a8a0b4ace377a21c45c381 # v3.8.0
         with:
-          node-version: '18'
+          node-version: 20
           cache: npm
 
       - run: npm install

.github/workflows/update_snapshot.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@bea5baf987ba7aa777a8a0b4ace377a21c45c381 # v3.8.0
         with:
-          node-version: '18'
+          node-version: 20
           cache: npm
 
       - name: Install dependencies

.nvmrc

@@ -0,0 +1 @@
+20

netlify.toml

@@ -4,7 +4,7 @@ command = "npm run build"
 
 [build.environment]
 NODE_OPTIONS = "--max_old_space_size=4096"
-NODE_VERSION = "18"
+NODE_VERSION = "20"
 GATSBY_CONCURRENT_DOWNLOAD = "15"
 GATSBY_CPU_COUNT = "1"