Disable CaptureException_AttachScreenshot_Threadsafe in CI (#4391)

Resolves #4389
- #4389

#skip-changelog

Author: jamescrosswell

test/Sentry.Maui.Tests/SentryMauiScreenshotTests.cs

@@ -184,6 +184,9 @@ public async Task CaptureException_BeforeCaptureScreenshot_DefaultAsync()
     [SkippableFact]
     public async Task CaptureException_AttachScreenshot_Threadsafe()
     {
+#if ANDROID
+         Skip.If(TestEnvironment.IsGitHubActions, "Flaky in CI on Android");
+#endif
         // Arrange
         var builder = _fixture.Builder.UseSentry(options => options.AttachScreenshot = true);
         await using var app = builder.Build();