Simplify CI

Author: garronej

.github/workflows/ci.yaml

@@ -10,17 +10,13 @@ on:
 jobs:
 
   test_node:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        node: [ '14', '21' ]
-        os: [ windows-latest, ubuntu-latest ]
-    name: Test with Node v${{ matrix.node }} on ${{ matrix.os }}
+    runs-on: ubuntu-latest
+    name: Test with Node
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-node@v3
       with:
-        node-version: ${{ matrix.node }}
+        node-version: 22
     - uses: bahmutov/npm-install@v1
     - run: yarn build
       env:
@@ -33,7 +29,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: actions/setup-node@v3
       with:
-        node-version: '15'
+        node-version: 22
     - name: Cache
       uses: actions/cache@v3
       with: