deps: Bump Testcontainers from 4.11.0 to 4.12.0

---
updated-dependencies:
- dependency-name: Testcontainers
  dependency-version: 4.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -13,7 +13,7 @@
     <PackageVersion Include="Microsoft.IO.RecyclableMemoryStream" Version="3.0.1" />
   </ItemGroup>
   <ItemGroup Label="Testing">
-    <PackageVersion Include="Testcontainers" Version="4.11.0" />
+    <PackageVersion Include="Testcontainers" Version="4.12.0" />
     <PackageVersion Include="xunit.v3.mtp-v2" Version="3.2.2" />
     <PackageVersion Include="PublicApiGenerator" Version="11.5.4" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />