(chore): prepare release notes (#1619)

Author: ilan-gold

Diff for: docs/release-notes/0.10.9.md

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+(v0.10.9)=
+### 0.10.9 {small}`2024-08-28`
+
+#### Bugfix
+
+- Fix writing large number of columns for `h5` files {user}`ilan-gold` {user}`selmanozleyen` ({pr}`1147`)
+- Add warning for setting `X` on a view with repeated indices {user}`ilan-gold` ({pr}`1501`)
+- Coerce {class}`numpy.matrix` classes to arrays when trying to store them in `AnnData` {user}`flying-sheep` ({pr}`1516`)
+- Fix for setting a dense `X` view with a sparse matrix {user}`ilan-gold` ({pr}`1532`)
+- Upper bound {mod}`numpy` for `gpu` installation on account of {issue}`cupy/cupy#8391` {user}`ilan-gold` ({pr}`1540`)
+- Upper bound dask on account of {issue}`1579` {user}`ilan-gold` ({pr}`1580`)
+- Ensure setting {attr}`pandas.DataFrame.index` on a view of a {class}`~anndata.AnnData` instantiates the {class}`~pandas.DataFrame` from the view {user}`ilan-gold` ({pr}`1586`)
+- Disallow using {class}`~pandas.DataFrame`s with multi-index columns {user}`ilan-gold` ({pr}`1589`)
+
+#### Development Process
+
+- create new `cupy` installation options for cuda 11 & 12 called `cu11` and `cu12` {user}`Intron7` ({pr}`1596`)
+
+#### Doc
+
+- add `callback` typing for {func}`~anndata.experimental.read_dispatched` and {func}`~anndata.experimental.write_dispatched` {user}`ilan-gold` ({pr}`1557`)
+
+#### Performance
+
+- Support for `concat_on_disk` outer join {user}`ilan-gold` ({pr}`1504`)