(chore): generate 0.12.14 release notes (#2438)

Author: ilan-gold

docs/release-notes/0.12.14.md

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+(v0.12.14)=
+### 0.12.14 {small}`2026-05-12`
+
+#### Bug fixes
+
+- {attr}`anndata.settings.auto_shard_zarr_v3` and {attr}`anndata.settings.zarr_write_format` are no longer dependent on each other, as stated in the docs {user}`ilan-gold` ({pr}`2427`)
+
+#### Performance
+
+- {attr}`anndata.settings.auto_shard_zarr_v3` now utilizes zarr's support for a target shard via `zarr.config.set({"array.target_shard_size_bytes" ...})` (only `zarr` version `>=3.1.4`) to make the target shard size 1GB (uncompressed) if not otherwise set. {user}`ilan-gold` ({pr}`2427`)