update toml to align with new pyproject toml standard and use new torchgeo release

[rbavery]

Description

Updates to pin to the latest torchgeo release or greater instead of a commit. 0.8.0 brings in a lot of new models, features, and update model metadata.

this currently fails due to an unrelated issue with our tests #133

After this is merged, I'd like to make a new minor release 0.5.0 for stac-model.

Related Issue

Type of Change

• 📚 Examples, docs, tutorials or dependencies update;
• 🔧 Bug fix (non-breaking change which fixes an issue);
• 🥂 Improvement (non-breaking change which improves an existing feature);
• 🚀 New feature (non-breaking change which adds functionality);
• 💥 Breaking change (fix or feature that would cause existing functionality to change);
• 🔐 Security fix.

Checklist

• I've read the CONTRIBUTING.md guide;
• I've updated the CHANGELOG.md with provided changes;
• I've updated the README.md and/or best-practices.md as applicable with new features;
• I've updated the code style using make check;
• I've written tests for all new methods and classes that I created;
• I've written the docstring in Google format for all the methods and classes that I used.

[fmigneault]

Since UNet is officially included, does that affect any of the examples that attempts loading the definition from torch definitions?

mlm/stac_model/examples.py

Lines 250 to 255 in 41a2cef

	from torchgeo.models import Unet_Weights, unet
	# Set the STAC version to 1.0.0 for compatibility with the example using relative links
	pystac.set_stac_version("1.0.0")
	weights = Unet_Weights.SENTINEL2_2CLASS_NC_FTW
	model = unet(weights=weights)

mlm/stac_model/examples.py

Lines 284 to 294 in 41a2cef

	item_ext = MLModelExtension.from_torch(
	model,
	task=task,
	weights=weights,
	item_id=item_id,
	collection=collection_id,
	bbox=bbox,
	geometry=geometry,
	datetime_range=datetime_range,
	stac_properties=properties,
	)

After this is merged, I'd like to make a new minor release 0.5.0 for stac-model.

Yes, but #133 should also be fixed. The releases should at least succeed at the point in time they were built.