go.mod: bump github.com/go4org/hashtriemap

* github.com/go4org/hashtriemap: https://github.com/go4org/hashtriemap/compare/45fcf11fca0e...44e5305f85d9

Triggered by @bradfitz via the bumpdep workflow.

Updates #21485

Signed-off-by: Dep Updater <noreply+dep-updater@tailscale.com>
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