build(deps): bump preact from 10.19.6 to 10.21.0 in /html

[dependabot]

Bumps preact from 10.19.6 to 10.21.0.

Release notes

Sourced from preact's releases.

10.21.0

Features

• Debug throw on too many rerenders (#4349, thanks @​rschristian)
• Add compat/client types (#4345, thanks @​rschristian)

Fixes

• Expose hooks through compat's ReactCurrentDispatcher (#4342, thanks @​rschristian)
• Respect default value (#4341, thanks @​JoviDeCroock)
• Incorrect "missing transform-jsx-source" warning (#4350, thanks @​rschristian)

Types

• Support ComponentChild(ren) in compat render/hydrate/createPortal (#4346, thanks @​rschristian)
• Import and re-export PreactElement (#3228, thanks @​henryqdineen)

Maintenance

• Add zustand and redux-toolkit to the demo. (#3523, thanks @​MortezaMirjavadi)
• Optimise jsx runtime (#4337, thanks @​JoviDeCroock)

10.20.2

Fixes

• Check whether oldDom is present in the DOM (#4318, thanks @​JoviDeCroock)
• Simplify the logic introduced in #4322 & use eventClock for capture events too (#4324, thanks @​jviide)
• Use a virtual clock instead of Date.now() for event dispatch times (#4322, thanks @​jviide)

Types

• Add template tag JSX type (#4334, thanks @​marvinhagemeister)

Maintenance

• Integrate the new benchmarks repo and update (#4310, thanks @​andrewiggins)
• Some byte improvements (#4321, thanks @​JoviDeCroock)

10.20.1

Fixes

• Add special case for focusIn and focusOut (#4316, thanks @​JoviDeCroock)

10.20.0

Features

• Add isMemo to compact to allow compatibility with react-is dependant libraries (#4302, thanks @​ziongh)

Fixes

... (truncated)

Commits

• a832512 10.21.0 (#4360)
• dbc4d61 Merge pull request #4350 from preactjs/fix/jsx-source-debug-warning
• 50c3f3e Merge branch 'main' into fix/jsx-source-debug-warning
• 613cacc feat: debug throw on too many rerenders (#4349)
• 2e2f5ab fix: Appease ESLint
• d4ff12e test: Add test for fixed jsx-source warning
• 61ce7a4 refactor: Slight rename
• 784af46 fix: Incorrect "missing transform-jsx-source" warning
• aa95aa9 Merge pull request #4346 from preactjs/types/fix-hydrate-render-createPortal
• 1fc799d refactor: Support ComponentChild(ren) in compat render/hydrate/createPortal
• Additional commits viewable in compare view

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[dependabot]

Superseded by #1362.