Bump futures-task from 0.3.4 to 0.3.21 in /todomvc-websys#15

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dependabot/cargo/todomvc-websys/futures-task-0.3.21extrawurst/rust-webview-todomvc-yew:dependabot/cargo/todomvc-websys/futures-task-0.3.21Copy head branch name to clipboard