fix: round aspect values to two decimal places

[joshuaellis]

Why

• resolves #215

This bug was brought in when we were trying to resolve homepage cards having their backgrounds bleed.

What

• rounds aspect ratio values to two fixed places in the Media component and the stitches util function.

Checklist

• [x] Ready to be merged

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Name	Status	Preview	Updated
companion-studio	✅ Ready (Inspect)	Visit Preview	May 24, 2022 at 7:31AM (UTC)