fix(NuxtPicture): make img-attrs and attrs responsive

[codeflorist]

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

The imgAttrs property in NuxtPicture was not responsive as of yet. This commit changes that.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 63.59%. Comparing base (e516ea3) to head (5443f12).

Files with missing lines	Patch %	Lines
src/runtime/components/NuxtPicture.vue	62.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1696      +/-   ##
==========================================
+ Coverage   63.56%   63.59%   +0.03%     
==========================================
  Files          79       79              
  Lines        3631     3634       +3     
  Branches      424      425       +1     
==========================================
+ Hits         2308     2311       +3     
  Misses       1295     1295              
  Partials       28       28              

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