(chore): generate 0.12.0rc3 release notes (#1994)

Author: ilan-gold

docs/release-notes/0.12.0rc2.md

@@ -1,14 +1,14 @@
 (v0.12.0rc2)=
 ### 0.12.0rc2 {small}`2025-05-15`
 
-### Bug fixes
+#### Bug fixes
 
 - Convert 1d {class}`numpy.ndarray` and {class}`cupy.ndarray`s in {attr}`anndata.AnnData.obsm` and {attr}`anndata.AnnData.varm` to 2d {user}`ilan-gold` ({pr}`1962`)
 
-### Features
+#### Features
 
 - Allow xarray Datasets to be used for obs/var/obsm/varm. {user}`ilia-kats` ({pr}`1966`)
 
-### Performance
+#### Performance
 
 - Load AnnLoader lazily to prevent expensive unnecessary `torch` imports when its available on the system. {user}`Zethson` & {user}`flying-sheep` ({pr}`1950`)

docs/release-notes/0.12.0rc3.md

@@ -0,0 +1,6 @@
+(v0.12.0rc3)=
+### 0.12.0rc3 {small}`2025-05-20`
+
+### Bug fixes
+
+- Update zarr v3 bound to >3.0.8 to prevent corrupted data {issue}`zarr-developers/zarr-python#3061` {user}`ilan-gold` ({pr}`1993`)