Remove stale deps, update version.

[5eeman]

No description provided.

[Copilot]

Pull request overview

This PR updates the package metadata and build environment for polygonid_flutter_sdk by bumping the package version, tightening the minimum supported Dart SDK, and removing stale dependency constraints so dependency resolution can rely on normal semver rules.

Changes:

• Bump package version to 2.4.1 and raise Dart SDK constraint to >=3.10.0 <4.0.0.
• Remove the stale encrypt dependency and remove pointycastle dependency overrides (including in the example app).
• Update CI Flutter version (common job) and refresh the example app lockfile accordingly.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
pubspec.yaml	Version bump, Dart SDK constraint bump, remove stale dependency and overrides.
example/pubspec.yaml	Remove pointycastle override from the example app.
example/pubspec.lock	Lockfile updated to reflect new resolution (no encrypt, pointycastle no longer “overridden”, other transitive bumps).
.github/workflows/polygonid_flutter_sdk.yml	Update Flutter version used by CI (common job).

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.77%. Comparing base (5f0aacf) to head (6d6592a).
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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #549   +/-   ##
========================================
  Coverage    17.77%   17.77%           
========================================
  Files          321      321           
  Lines        10675    10675           
========================================
  Hits          1898     1898           
  Misses        8777     8777           

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