Bump dart sdk version to 1.3.3, bump some other versions

[matux]

Description of the change

Bumped Dart SDK to 1.3.3 to reflect the notifier version report fix (pub.dev won't accept changes in packages with the same version)

Also updated some other versions.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Maintenance
• New release

[Copilot]

Pull request overview

This PR bumps the Dart SDK version to 1.3.3 to fix a notifier version reporting issue and updates related package versions across the rollbar-dart and rollbar-flutter ecosystem.

Key Changes:

• Updated rollbar_dart SDK from 1.3.2 to 1.3.3 with corresponding notifier version fix
• Updated rollbar_flutter example dependency to reference the new rollbar_flutter version (^1.5.0)
• Updated build tools SDK version to 3.38.5

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
rollbar_dart/pubspec.yaml	Bumped package version to 1.3.3
rollbar_dart/lib/src/notifier/notifier.dart	Updated notifier version constant to match package version
rollbar_dart/example/pubspec.yaml	Updated example app version to 1.3.3
rollbar_dart/CHANGELOG.md	Added changelog entry for version 1.3.3
rollbar_flutter/example/pubspec.yaml	Updated example app version to 1.5.2 and rollbar_flutter dependency to ^1.5.0
build_tools/SDK_VERSION	Updated build tools SDK version to 3.38.5

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