Create 2.8.1.md (#400)

content/release-notes/2.8.1.md

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+---
+title: Haystack 2.8.1
+description: Release notes for Haystack 2.8.1
+featured_image: /images/release-notes.png
+images: ["/images/release-notes.png"]
+toc: True
+date: 2025-01-10
+last_updated: 2025-01-10
+tags: ["Release Notes"]
+link: https://github.com/deepset-ai/haystack/releases/tag/v2.8.1
+---
+
+# Release Notes
+
+## 🐛 Bug Fixes
+-   Pin OpenAI client to \>=1.56.1 to avoid issues related to changes in the httpx library.
+-   PyPDFToDocument now creates documents with id based on converted text and meta data. Before it didn't take the meta data into account.
+-   Fixes issues with deserialization of components in multi-threaded environments.