build: Upgrade to Node 24 (openedx#2459)

Author: bydawen

.github/workflows/validate.yml

@@ -12,13 +12,12 @@ jobs:
     strategy:
       matrix:
         node: [20, 24]
-    continue-on-error: ${{ matrix.node == 24 }}
 
     steps:
     - uses: actions/checkout@v5
     - uses: actions/setup-node@v5
       with:
-        node-version: ${{ matrix.node }}
+        node-version-file: '.nvmrc'
     - run: make validate.ci
     - name: Archive code coverage results
       uses: actions/upload-artifact@v4

.nvmrc

@@ -1 +1 @@
-20
+24