[BUG] NullReferenceException in Connection.WrapApiCallAsync

[limitisbsc]

Context:

• Playwright Version: 1.20.1
• Operating System: Windows
• .NET version: net6.0
• Browser: Firefox

Related pull request
check namespace for null #2067

Describe the bug
If ReflectedType is null a NullReferenceException is thrown
Line in question at https://github.com/microsoft/playwright-dotnet/blob/main/src/Playwright/Transport/Connection.cs#L442

                string cSharpNamespace = sf.GetMethod().ReflectedType.Namespace;
                bool playwrightInternal = cSharpNamespace != null &&
                                          (cSharpNamespace == "Microsoft.Playwright" ||
                                          cSharpNamespace.StartsWith("Microsoft.Playwright.Core", StringComparison.InvariantCultureIgnoreCase) ||
                                          cSharpNamespace.StartsWith("Microsoft.Playwright.Transport", StringComparison.InvariantCultureIgnoreCase) ||
                                          cSharpNamespace.StartsWith("Microsoft.Playwright.Helpers", StringComparison.InvariantCultureIgnoreCase));

Fix

                string cSharpNamespace = sf.GetMethod().ReflectedType?.Namespace;

[mxschmitt]

@limbsc are you interested in creating a PR with the fix?