Rename introspection stream variable for clarity

Agent-Logs-Url: https://github.com/fsprojects/FSharp.Data.GraphQL/sessions/4998e0af-9a24-4088-a9a9-3318b08f3de9

Co-authored-by: xperiandri <2365592+xperiandri@users.noreply.github.com>

Author: Copilot

tests/FSharp.Data.GraphQL.IntegrationTests/IntrospectionUpdateTests.fs

@@ -84,7 +84,7 @@ let ``Update integration introspection file when schema changes`` () =
         Assert.True(File.Exists introspectionFilePath)
         if wasUpdated then
             let! sourceStreamSecondRun = httpClient.GetStreamAsync("/")
-            use sourceStreamSecondRun = sourceStreamSecondRun
-            let! wasUpdatedSecondRun = updateIntrospectionFileAsync CancellationToken.None sourceStreamSecondRun
+            use sourceStreamForVerification = sourceStreamSecondRun
+            let! wasUpdatedSecondRun = updateIntrospectionFileAsync CancellationToken.None sourceStreamForVerification
             Assert.False wasUpdatedSecondRun
     }