Add 0.5.7 bugfix news entry

Author: ellmetha

news/2025/2025-06-30-marten-bugfix-release-0.5.7.md

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+# Marten bugfix release: 0.5.7
+
+Today we've issued the [0.5.7 bugfix release](https://martenframework.com/docs/the-marten-project/release-notes/0.5.7).
+
+## Changes since 0.5.6
+
+Please head over to the [official Marten release notes](https://martenframework.com/docs/the-marten-project/release-notes/0.5.7) for an overview of the changes that are part of this bugfix release.
+
+Alternatively, you can check out the [full list of changes and commits on GitHub](https://github.com/martenframework/marten/compare/v0.5.6...v0.5.7).

news/manifest.yml

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 news:
+  - title: "Marten bugfix release: 0.5.7"
+    description: Marten 0.5.7 introduces bug fixes, enhancing the stability and performance of the framework for a more reliable development experience.
+    file: 2025/2025-06-30-marten-bugfix-release-0.5.7.md
+    author:
+      name: Morgan Aubert
+      github: https://github.com/ellmetha
   - title: "Marten bugfix release: 0.5.6"
     description: Marten 0.5.6 introduces bug fixes, enhancing the stability and performance of the framework for a more reliable development experience.
     file: 2025/2025-05-14-marten-bugfix-release-0.5.6.md