chore: set v1.56.1

Update Playwright.NET version to 1.56.1 to align with upstream Playwright driver.
This includes bumping AssemblyVersion and ensuring DriverVersion is set to 1.56.1.

Author: lucassc

src/Common/Version.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <AssemblyVersion>1.55.0</AssemblyVersion>
+    <AssemblyVersion>1.56.1</AssemblyVersion>
     <PackageVersion>$(AssemblyVersion)</PackageVersion>
     <DriverVersion>1.56.1</DriverVersion>
     <ReleaseVersion>$(AssemblyVersion)</ReleaseVersion>