feat: Prepare next release cycle (3.0.0) (#820)

Author: HofmeisterAn

Directory.Build.props

@@ -5,7 +5,7 @@
   </PropertyGroup>
   <PropertyGroup>
     <PackageId>$(AssemblyName)</PackageId>
-    <Version>2.5.0</Version>
+    <Version>3.0.0</Version>
     <AssemblyVersion>$(Version)</AssemblyVersion>
     <FileVersion>$(Version)</FileVersion>
     <Product>Testcontainers</Product>