Release v2.64.0-pre1

What's Changed

• doc: fix typo by @WeihanLi in #2432
• doc: fix typo by @WeihanLi in #2431
• ci: upgrade checkout action version by @WeihanLi in #2434
• build: configure rollForward in global.json by @WeihanLi in #2437
• Support some HttpClientAction settings and log debug message instead of an error by @JamesNK in #2448
• Assign primary handler before other configuration by @JamesNK in #2445
• Update various package versions by @JamesNK in #2453
• Update Grpc.Tools to 2.64.0 by @JamesNK in #2456
• Change functional tests to use dynamic ports by @JamesNK in #2458
• Add WriteResponseHeadersAsync test by @JamesNK in #2452
• Update repo for .NET 9 by @JamesNK in #2457
• Fix flaky ConnectTimeout_MultipleCalls_AttemptReconnect test by @JamesNK in #2460
• Bump branch version to 2.64.0-pre1 by @stanley-cheung in #2471
• [2.64.x] Update Native.DetectWindowsVersion() to consider Windows Server 2019 to be Window Server by @JamesNK in #2473

Full Changelog: v2.63.0...v2.64.0-pre1