ci: drop Node.js 8 from the 2.x test matrix

Node.js 8 is EOL and the current dependency tree requires >= 14
(undici, formdata-node, etc.), so the v8 jobs crash regardless of
the test changes.

Author: fengmk2

.github/workflows/nodejs-2.x.yml

@@ -12,6 +12,6 @@ jobs:
     uses: node-modules/github-actions/.github/workflows/node-test.yml@master
     with:
       os: 'ubuntu-latest, macos-latest, windows-latest'
-      version: '8, 10, 12, 14, 16, 18, 20, 22'
+      version: '10, 12, 14, 16, 18, 20, 22'
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}