fix: Duration precision on Windows

[ArthurHeitmann]

Description

Fixes the precision of seek, getCurrentPosition, getDuration and their streams on windows. Currently, due to a casting bug, the precision is 1 second.

Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs:, chore: etc).
• I have read the Contributor Guide and followed the process outlined for submitting PRs.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation and added dartdoc comments with ///, where necessary.
• I have updated/added relevant examples in example.

Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

Related Issues

None

[spydon]

This test fails:
https://github.com/bluefireteam/audioplayers/blob/main/packages/audioplayers/example/integration_test/app_test.dart#L58-L62

[luanpotter]

LGTM, thanks!