chore: drop ESLint 8 from CI test matrix

Only test against ESLint 9 and 10, removing ESLint 8 support from CI.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: amilajack

.github/workflows/test.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        eslint-version: [8, 9, 10]
+        eslint-version: [9, 10]
     name: Test (Node 22, ESLint ${{ matrix.eslint-version }})
     steps:
       - name: Check out Git repository
@@ -20,13 +20,4 @@ jobs:
       - name: Install ESLint ${{ matrix.eslint-version }}
         run: npm i -D eslint@${{ matrix.eslint-version }} --legacy-peer-deps
       - name: Run tests
-        run: |
-          if [ "${{ matrix.eslint-version }}" = "8" ]; then
-            npm test
-          else
-            npm run build && npm run spec -- --testPathIgnorePatterns="test/e2e-repo.spec.ts|test/flat-config-typing.spec.ts"
-          fi
-      - name: Run e2e tests
-        # Skip e2e tests for ESLint 9+ due to API incompatibilities
-        if: matrix.eslint-version == '8'
-        run: npm run spec:e2e
+        run: npm run build && npm run spec -- --testPathIgnorePatterns="test/e2e-repo.spec.ts|test/flat-config-typing.spec.ts"