Bump the testcontainers group with 4 updates

Bumps Testcontainers from 4.7.0 to 4.8.1
Bumps Testcontainers.Kafka from 4.7.0 to 4.8.1
Bumps Testcontainers.Keycloak from 4.7.0 to 4.8.1
Bumps Testcontainers.RabbitMq 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
  dependency-group: testcontainers
- dependency-name: Testcontainers.Kafka
  dependency-version: 4.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: testcontainers
- dependency-name: Testcontainers.Keycloak
  dependency-version: 4.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: testcontainers
- dependency-name: Testcontainers.RabbitMq
  dependency-version: 4.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: testcontainers
...

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

Author: dependabot[bot]

src/Microcks.Testcontainers/Microcks.Testcontainers.csproj

@@ -5,7 +5,7 @@
         <GenerateSBOM>true</GenerateSBOM>
     </PropertyGroup>
     <ItemGroup>
-		<PackageReference Include="Testcontainers" Version="4.7.0" />
+		<PackageReference Include="Testcontainers" Version="4.8.1" />
         <PackageReference Include="System.Net.Http.Json" Version="9.0.10" />
         <PackageReference Include="Microsoft.Sbom.Targets" Version="4.1.2">
             <PrivateAssets>all</PrivateAssets>

tests/Microcks.Testcontainers.Tests/Microcks.Testcontainers.Tests.csproj

@@ -12,9 +12,9 @@
     <PackageReference Include="RabbitMQ.Client" Version="7.1.2" />
     <PackageReference Include="RestAssured.Net" Version="4.8.0" />
     <PackageReference Include="Confluent.Kafka" Version="2.12.0" />
-    <PackageReference Include="TestContainers.Kafka" Version="4.7.0" />
-    <PackageReference Include="TestContainers.Keycloak" Version="4.7.0" />
-    <PackageReference Include="Testcontainers.RabbitMq" Version="4.7.0" />
+    <PackageReference Include="TestContainers.Kafka" Version="4.8.1" />
+    <PackageReference Include="TestContainers.Keycloak" Version="4.8.1" />
+    <PackageReference Include="Testcontainers.RabbitMq" Version="4.8.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>