Bump the ai-services group across 1 directory with 4 updates

Updates the requirements on [openai](https://github.com/openai/openai-python), [powermem](https://github.com/oceanbase/powermem), [dashscope](https://dashscope.aliyun.com/) and [markitdown](https://github.com/microsoft/markitdown) to permit the latest version.

Updates `openai` from 2.8.1 to 3.41.0
- [Release notes](https://github.com/openai/openai-python/releases)
- [Changelog](https://github.com/openai/openai-python/blob/main/CHANGELOG.md)
- [Commits](https://github.com/openai/openai-python/compare/v2.8.1...v3.41.0)

Updates `powermem` to 1.1.7
- [Release notes](https://github.com/oceanbase/powermem/releases)
- [Commits](https://github.com/oceanbase/powermem/compare/v0.3.1...v1.1.7)

Updates `dashscope` from 1.27.7 to 2.0.2

Updates `markitdown` from 0.1.8 to 0.1.9
- [Release notes](https://github.com/microsoft/markitdown/releases)
- [Commits](https://github.com/microsoft/markitdown/compare/v0.1.8...v0.1.9)

---
updated-dependencies:
- dependency-name: openai
  dependency-version: 3.41.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: ai-services
- dependency-name: powermem
  dependency-version: 1.1.7
  dependency-type: direct:production
  dependency-group: ai-services
- dependency-name: dashscope
  dependency-version: 2.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: ai-services
- dependency-name: markitdown
  dependency-version: 0.1.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ai-services
...

Signed-off-by: dependabot[bot] <support@github.com>

main/xiaozhi-server/requirements.txt

@@ -13,7 +13,7 @@ pydub==0.25.1
 funasr==1.4.16
 # transformers>=5 要求 torch>=2.6，与本项目 torch 2.2.2 冲突（会禁用 PyTorch，fun_local 加载不了模型）
 transformers<5
-openai==2.8.1
+openai==3.41.0
 google-generativeai==0.8.6
 edge_tts==7.3.1
 httpx==0.28.1
@@ -25,17 +25,17 @@ loguru==0.7.3
 requests==2.34.2
 cozepy==0.20.0
 mem0ai==2.2.1
-powermem>=0.3.1
+powermem>=1.1.7
 bs4==0.0.2
 modelscope==1.40.2
 sherpa_onnx==1.13.8
 mcp==2.3.0
 cnlunar==0.2.5
 PySocks==1.7.1
-dashscope==1.27.7
+dashscope==2.0.2
 baidu-aip==4.16.13
 aioconsole==0.8.2
-markitdown==0.1.8
+markitdown==0.1.9
 mcp-proxy==0.12.0
 PyJWT==2.15.1
 psutil==7.2.2