ci: update github actions to latest major versions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: silverwind

.github/workflows/ci.yaml

@@ -10,13 +10,13 @@ jobs:
         node: [22, 24]
     runs-on: ${{matrix.os}}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           cache: pnpm
           node-version: ${{matrix.node}}
-      - uses: oven-sh/setup-bun@v1
+      - uses: oven-sh/setup-bun@v2
         with:
           bun-version: latest
       - run: make lint test