v16.4.0-canary.20

Misc Changes

• test(turbopack): remove dead top-level task unmarks: #98246
• Fix flaky successive HMR changes test: #97610
• docs: Remove version label from Turbopack in Pages Router: #98316
• turbo-tasks-backend: fix strongly consistent read hanging on a canceled task: #98312

Credits

Huge thanks to @lukesandberg, @sokra, and @icyJoseph for helping!