Remove intl-format-cache dependency

[connor-baer]

Purpose

The intl-format-cache is unmaintained and incompatible with ES modules due to its bundling.

Approach and changes

• Write a custom memoize function inspired by intl-format-cache

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests
• Meets minimum browser support
• Meets accessibility requirements

[changeset-bot]

🦋 Changeset detected

Latest commit: bd0e066

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

This PR includes changesets to release 1 package

Name	Type
@sumup-oss/intl	Patch

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[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.48%. Comparing base (12da01b) to head (bd0e066).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib/memoize.ts	94.11%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #270      +/-   ##
==========================================
+ Coverage   93.46%   93.48%   +0.01%     
==========================================
  Files          15       16       +1     
  Lines         689      721      +32     
  Branches       85       97      +12     
==========================================
+ Hits          644      674      +30     
- Misses         43       45       +2     
  Partials        2        2              

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