langchain-together breaks with v1 versions of langchain-openai and so on

### Checked other resources - [x] This is a bug, not a usage question. - [x] I added a clear and descriptive title that summarizes this issue. - [x] I used the GitHub search to find a similar question and didn't find it. - [x] I am sure that this is a bug in LangChain rather than my code. - [x] The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package). - [x] This is not related to the langchain-community package. - [x] I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS. ### Package (Required) - [x] langchain - [x] langchain-openai - [ ] langchain-anthropic - [ ] langchain-classic - [ ] langchain-core - [ ] langchain-model-profiles - [ ] langchain-tests - [ ] langchain-text-splitters - [ ] langchain-chroma - [ ] langchain-deepseek - [ ] langchain-exa - [ ] langchain-fireworks - [ ] langchain-groq - [ ] langchain-huggingface - [ ] langchain-mistralai - [ ] langchain-nomic - [ ] langchain-ollama - [ ] langchain-openrouter - [ ] langchain-perplexity - [ ] langchain-qdrant - [ ] langchain-xai - [ ] Other / not sure / general ### Related Issues / PRs _No response_ ### Reproduction Steps / Example Code (Python) ```python uv sync --all-packages × No solution found when resolving dependencies for split (python_full_version >= '3.14' and sys_platform == 'win32'): ╰─▶ Because only langchain-together<=0.3.1 is available and traza-ai-core depends on langchain-together>=1.0, we can conclude that traza-ai-core's requirements are unsatisfiable. And because your workspace requires traza-ai-core, we can conclude that your workspace's requirements are unsatisfiable. make: *** [install] Error 1 ``` ### Error Message and Stack Trace (if applicable) ```shell ``` ### Description When i try to use together ai latest version it has deps issues with the existing v1 of other providers: "uv sync --all-packages × No solution found when resolving dependencies for split (python_f…