Use node 20 (latest LTS version) instead of 18/19

Author: cknitt

.github/workflows/check-build.yml

@@ -12,10 +12,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: Use Node.js 19
+      - name: Use Node.js 20
         uses: actions/setup-node@v3
         with:
-          node-version: 19
+          node-version: 20
       - run: npm install
       - run: npm run build
       - name: JS Files Changed

.github/workflows/style.yml

@@ -12,10 +12,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: Use Node.js 19
+      - name: Use Node.js 20
         uses: actions/setup-node@v3
         with:
-          node-version: 19
+          node-version: 20
       - run: npm install
       - run: npx rescript format -all -check
       - name: Helpful error message

.github/workflows/test-doc-examples.yml

@@ -12,10 +12,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: Use Node.js 18
+      - name: Use Node.js 20
         uses: actions/setup-node@v3
         with:
-          node-version: 18
+          node-version: 20
       - run: npm install
       - run: npm run build
       - run: npm run test-doc-examples