Bump Testcontainers from 4.7.0 to 4.8.1

---
updated-dependencies:
- dependency-name: Testcontainers
  dependency-version: 4.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

eFormAPI/Plugins/OuterInnerResource.Pn/OuterInnerResource.Pn.Test/OuterInnerResource.Pn.Test.csproj

@@ -15,7 +15,7 @@
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="NUnit3TestAdapter" Version="5.2.0" />
-    <PackageReference Include="Testcontainers" Version="4.7.0" />
+    <PackageReference Include="Testcontainers" Version="4.8.1" />
     <PackageReference Include="Testcontainers.Mariadb" Version="4.7.0" />
   </ItemGroup>