chore: Backport PR #2421 on branch main ((chore): generate 0.12.12 release notes) (#2441)

Co-authored-by: Ilan Gold <ilanbassgold@gmail.com>

Author: meeseeksmachine

docs/release-notes/0.12.12.md

@@ -0,0 +1,7 @@
+(v0.12.12)=
+### 0.12.12 {small}`2026-05-06`
+
+#### Bug fixes
+
+- Disallow {meth}`anndata.AnnData.transpose` when `X` or `layers` contains {class}`h5py.Dataset`, {class}`zarr.Array` ,{class}`anndata.abc.CSRDataset`, or {class}`anndata.abc.CSCDataset` {user}`ilan-gold`. ({pr}`2399`)
+- Don't force {attr}`anndata.settings.check_uniqueness` if user loads an annotation index with {func}`anndata.experimental.read_lazy` {user}`ilan-gold`. ({pr}`2419`)