⬆️ Bump mkdocs-material

[adriencaccia]

Following #1760, highlighted code color in the dark theme was nearly impossible to read, as @anglid stated in #725.

Later in that issue, @squidfunk stated that by bumping mkdocs-material to 5.5.0, the colors will be better.

• Light theme before:
  

• Light theme now:
  

• Dark theme before:
  

• Dark theme now:
  

[codecov]

Codecov Report

Merging #1789 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #1789   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          235       235           
  Lines         6989      6989           
=========================================
  Hits          6989      6989           

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[github-actions]

📝 Docs preview for commit 084f47e at: https://5f1c219b757708e92a319bdf--fastapi.netlify.app

[tiangolo]

Great, thanks for your contribution! And thanks for taking the time to take the screenshots 🚀 🎨