Bolt v2.7.3 Released

This is a patch release to address an issue with the Image component's lazyloading behavior that was causing the fallback image (src attribute) to not display as expected in older browsers that don't natively support srcset.

This update adjusts the <img> tag's HTML to more closely match the recommended lazysizes config + adds additional tests to help catch issues like this in the future. Also adds an extra fallback layer to try and generate a fallback src path if srcset is defined.

Updated Packages:
 - @bolt/[email protected]
 - @bolt/[email protected]
 - @bolt/[email protected]
 - @bolt/[email protected]
 - @bolt/[email protected]
 - @bolt/[email protected]
 - @bolt/[email protected]
 - @bolt/[email protected]
 - @bolt/[email protected]