Update MetaGraphs compat to allow 0.8

[SimonAB]

Description

This PR updates the MetaGraphs compatibility constraint to include version 0.8.

Change: MetaGraphs = "0.7.0" → MetaGraphs = "0.7, 0.8"

Motivation

MetaGraphs 0.8 has been released and is being used by other packages in the ecosystem. This update allows LightOSM.jl to be compatible with projects that require MetaGraphs 0.8, improving interoperability and enabling users to use the latest versions without conflicts.

Testing

• Package precompiles successfully with MetaGraphs 0.8
• No breaking changes observed
• Compatible with existing MetaGraphs 0.7 versions

Type of change

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

Checklist

• Added an entry in CHANGELOG.md (for new features and breaking changes)
• Added or changed relevant sections in the documentation
• Added unit tests for new algorithms, conversion methods, etc.
• Added reference image tests for new plotting functions, recipes, visual options, etc.

Note: This is a compatibility update that doesn't require documentation changes or new tests.

[Copilot]

Copilot wasn't able to review any files in this pull request.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.