Update storybook monorepo to v7.6.20

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@storybook/addon-essentials (source)	`7.6.19` -> `7.6.20`
@storybook/addon-interactions (source)	`7.6.19` -> `7.6.20`
@storybook/addon-links (source)	`7.6.19` -> `7.6.20`
@storybook/blocks (source)	`7.6.19` -> `7.6.20`
@storybook/react (source)	`7.6.19` -> `7.6.20`
storybook (source)	`7.6.19` -> `7.6.20`

Release Notes

storybookjs/storybook (@storybook/addon-essentials)

### [`v7.6.20`](https://togithub.com/storybookjs/storybook/compare/v7.6.19...1fe1c392ba3a940d9ada34704c00b0f38c38e735) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v7.6.19...1fe1c392ba3a940d9ada34704c00b0f38c38e735)

storybookjs/storybook (@storybook/addon-interactions)

storybookjs/storybook (@storybook/addon-links)

storybookjs/storybook (@storybook/blocks)

storybookjs/storybook (@storybook/react)

storybookjs/storybook (storybook)

Configuration

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.37%. Comparing base (bfd7a26) to head (0dc1f68). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #20450 +/- ## ========================================== - Coverage 73.39% 73.37% -0.02% ========================================== Files 1269 1269 Lines 74765 74765 Branches 9959 9959 ========================================== - Hits 54872 54861 -11 - Misses 19084 19094 +10 - Partials 809 810 +1 ``` | [Flag](https://app.codecov.io/gh/TryGhost/Ghost/pull/20450/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TryGhost) | Coverage Δ | | |---|---|---| | [admin-tests](https://app.codecov.io/gh/TryGhost/Ghost/pull/20450/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TryGhost) | `42.73% <ø> (-0.07%)` | :arrow_down: | | [e2e-tests](https://app.codecov.io/gh/TryGhost/Ghost/pull/20450/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TryGhost) | `81.84% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TryGhost#carryforward-flags-in-the-pull-request-comment) to find out more.

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