ci: 添加最新更改的 CI工作流

- 新增 Latest Changes 工作流，用于在合并 PR 时更新发布说明- 在 master 分支上监听 PR 关闭事件，自动更新最新更改
- 使用 tiangolo/latest-changes 动作处理最新更改内容
- 配置相关参数，包括 GitHub token、最新更改文件路径、最新更改标题等

.github/workflows/latest-changes.yml

@@ -0,0 +1,40 @@
+name: Latest Changes
+
+on:
+  pull_request_target:
+    branches:
+      - master
+    types:
+      - closed
+  workflow_dispatch:
+    inputs:
+      number:
+        description: PR number
+        required: true
+      debug_enabled:
+        description: "在启用 tmate 调试的情况下运行构建 (https://github.com/marketplace/actions/debugging-with-tmate)"
+        required: false
+        default: "false"
+
+jobs:
+  latest-changes:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: read
+    steps:
+      - name: Dump GitHub context
+        env:
+          GITHUB_CONTEXT: ${{ toJson(github) }}
+        run: echo "$GITHUB_CONTEXT"
+      - uses: actions/checkout@v4
+        with:
+          # 允许将最新更改提交到主分支
+          token: ${{ secrets.GIT_TOKEN }}
+      - uses: tiangolo/latest-changes@0.3.2
+        with:
+          token: ${{ secrets.GIT_TOKEN }}
+          latest_changes_file: ./release-notes.md
+          latest_changes_header: "## Latest Changes"
+          end_regex: "^## "
+          debug_logs: true
+          label_header_prefix: "### "