fix(rust): make Windows release test sockets blocking

[afonsojramos]

Windows release tests intermittently fail with WouldBlock when the classmap HTTP fixture accepts a connection before its request arrives. The accepted socket inherits the listener's nonblocking mode on Windows; explicitly make it blocking before setting the existing five-second read timeout.

This changes only the test fixture and bumps the workspace to beta.19. Beta.18 already has Linux and macOS assets, so its published tag stays intact and beta.19 will provide a complete release for all platforms.

Validation: all three compatibility-refresh tests pass locally; formatting passes. Correctness and testing review found no issues. Windows CI must pass before merge.

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