chore(deps): bump Umbraco.Cms.Web.BackOffice from 10.3.0 to 10.8.4

Bumps [Umbraco.Cms.Web.BackOffice](https://github.com/umbraco/Umbraco-CMS) from 10.3.0 to 10.8.4.
- [Release notes](https://github.com/umbraco/Umbraco-CMS/releases)
- [Commits](umbraco/Umbraco-CMS@release-10.3.0...release-10.8.4)

---
updated-dependencies:
- dependency-name: Umbraco.Cms.Web.BackOffice
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/Umbraco.Community.BackOfficeOrganiser/Umbraco.Community.BackOfficeOrganiser.csproj

@@ -25,7 +25,7 @@
 	<ItemGroup>
 		<PackageReference Include="jcdcdev.Umbraco.Core" Version="0.2.1"/>
 		<PackageReference Include="Umbraco.Cms.Web.Website" Version="10.3.0"/>
-		<PackageReference Include="Umbraco.Cms.Web.BackOffice" Version="10.3.0"/>
+		<PackageReference Include="Umbraco.Cms.Web.BackOffice" Version="10.8.4"/>
 		<PackageReference Include="Umbraco.Community.SimpleDashboards" Version="0.2.0"/>
 	</ItemGroup>