fix(deps): update dependency astro to ^2.1.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
astro (source)	^2.1.6 -> ^2.1.7

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Release Notes

withastro/astro

v2.1.7

Compare Source

Patch Changes

• #​6192 b7194103e Thanks @​erg208! - Updated to fix the Node SSR fails on POST with Express JSON middleware

• #​6630 cfcf2e2ff Thanks @​bholmesdev! - Support automatic image optimization for Markdoc images when using experimental.assets. You can follow our Assets guide to enable this feature in your project. Then, start using relative or aliased image sources in your Markdoc files for automatic optimization:

  <!--Relative paths-->
  
  ![The Milky Way Galaxy](../assets/galaxy.jpg)
  
  <!--Or configured aliases-->
  
  ![Houston smiling and looking cute](~/assets/houston-smiling.jpg)

• #​6647 45da39a86 Thanks @​bluwy! - Fix --mode flag for builds

• #​6638 7daef9a29 Thanks @​matthewp! - Avoid implicit head injection when a head is in the tree

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