Bump testcontainers-dotnet monorepo to 4.8.1 (#3355)

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Directory.Packages.props

@@ -132,9 +132,9 @@
     <PackageVersion Include="System.Reflection.DispatchProxy" Version="4.8.2" />
     <PackageVersion Include="System.ServiceModel.Http" Version="8.1.2" />
     <PackageVersion Include="System.ServiceModel.NetTcp" Version="8.1.2" />
-    <PackageVersion Include="Testcontainers.MsSql" Version="4.8.0" />
-    <PackageVersion Include="Testcontainers.MySql" Version="4.8.0" />
-    <PackageVersion Include="Testcontainers.PostgreSql" Version="4.8.0" />
+    <PackageVersion Include="Testcontainers.MsSql" Version="4.8.1" />
+    <PackageVersion Include="Testcontainers.MySql" Version="4.8.1" />
+    <PackageVersion Include="Testcontainers.PostgreSql" Version="4.8.1" />
     <PackageVersion Include="Wiremock.Net" Version="1.15.0" />
     <!-- Microsoft.AspNetCore.Server.Kestrel.Core is transitive dependency for Wiremock.Net. It is here to fix https://github.com/advisories/GHSA-5rrx-jjjq-q2r5 -->
     <PackageVersion Include="Microsoft.AspNetCore.Server.Kestrel.Core" Version="2.3.6" />