Backport PR #2398: (chore): generate 0.12.11 release notes

Author: ilan-gold

docs/release-notes/0.12.11.md

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+(v0.12.11)=
+### 0.12.11 {small}`2026-04-21`
+
+#### Bug fixes
+
+- {attr}`anndata.settings.zarr_write_format` and {attr}`anndata.settings.auto_shard_zarr_v3` can now be set together {user}`ilan-gold` ({pr}`2342`)
+- Check `Raw` length on creation and fix associated `.adata` in `Raw` slicing {user}`P Angerer` ({pr}`2351`)
+- Ensure the index name along `obs` and `var` are not lost when reading/writing to disk after reading with {func}`~anndata.experimental.read_lazy` {user}`ilan-gold` ({pr}`2358`)
+
+#### Performance
+
+- Accelerate outer joins on dask-sparse matrices with unchunked minor axes in {func}`anndata.concat` {user}`ilan-gold` ({pr}`2395`)