Upgrade to Prettier v3

[connor-baer]

Purpose

Prettier v3 was released in July 2023. The most notable change for us is the migration to ESM and a fully asynchronous API. Prettier is still compatible with CJS codebases and doesn't break Foundry's support for ESLint (which doesn't support ESM yet).

Approach and changes

• Upgrade to Prettier v3
• Migrate to the asynchronous API

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests

[changeset-bot]

🦋 Changeset detected

Latest commit: 959aff7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@sumup/foundry	Major

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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (7d49597) 63.45% compared to head (959aff7) 63.50%.

Files	Patch %	Lines
src/lib/files.ts	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #912      +/-   ##
==========================================
+ Coverage   63.45%   63.50%   +0.05%     
==========================================
  Files          26       26              
  Lines        1970     1973       +3     
  Branches       95       95              
==========================================
+ Hits         1250     1253       +3     
  Misses        712      712              
  Partials        8        8              

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