fix(deps): update dependency flutter_markdown to ^0.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
flutter_markdown (source)	dependencies	minor	^0.6.18 -> ^0.7.0

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Release Notes

flutter/packages (flutter_markdown)

### [`v0.7.2`](https://togithub.com/flutter/packages/blob/HEAD/packages/flutter_markdown/CHANGELOG.md#072) [Compare Source](https://togithub.com/flutter/packages/compare/flutter_markdown-v0.7.1...flutter_markdown-v0.7.2) - Multiple code blocks within a single markdown will now use separate ScrollControllers. ### [`v0.7.1`](https://togithub.com/flutter/packages/blob/HEAD/packages/flutter_markdown/CHANGELOG.md#071) [Compare Source](https://togithub.com/flutter/packages/compare/flutter_markdown-v0.7.0...flutter_markdown-v0.7.1) - Allows for choosing a custom font feature to create superscript in footnotes when the font does not support the `supr` font feature. - Use the `superscriptFontFeatureTag` property in `MarkdownStyleSheet`. - For example, for the `Roboto` font which doesn't support `supr`, you can set `numr`. ### [`v0.7.0`](https://togithub.com/flutter/packages/blob/HEAD/packages/flutter_markdown/CHANGELOG.md#070) [Compare Source](https://togithub.com/flutter/packages/compare/flutter_markdown-v0.6.23...flutter_markdown-v0.7.0) - **BREAKING CHANGES**: - Replaces parameters at `bulletBuilder` with `MarkdownBulletParameters`. - Introduces a new parameter `nestLevel` that exposes the bullet item's nesting level.

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