Add additional path to check for ios dsyms

[buenaflor]

📜 Description

💡 Motivation and Context

Seems like fastlane outputs the dsyms in root/ios/build

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- Add additional path to check for ios dsyms ([#342](https://github.com/getsentry/sentry-dart-plugin/pull/342))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description.

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