Python Update and Defunct Model Cleaning

[aritraghsh09]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the codebase to support Python 3.10+ and removes deprecated GGT models (ggt and ggt_no_gconv) that are no longer maintained. The changes include cleaning up model references, updating documentation to reflect the changes, and modernizing PyTorch API usage.

Key changes:

• Removal of defunct GGT models and their associated test cases
• Update of PyTorch VGG16 model instantiation to use the new weights parameter syntax
• Documentation updates to reflect Python 3.10+ requirement and deprecated models

Reviewed Changes

Copilot reviewed 10 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
ggt/tests/test_models.py	Removes test cases for deprecated GGT models
ggt/models/init.py	Removes GGT model imports and factory method references
ggt/models/vgg.py	Updates VGG16 model instantiation to use modern PyTorch weights syntax
docs/source/Using_GaMPEN.md	Documents removal of GGT models with strikethrough formatting
docs/source/Getting_Started.md	Updates Python version requirement from 3.7/3.8 to 3.10+
.github/workflows/main.yml	Updates CI pipeline to use Python 3.10
ggt/modules/autocrop.py	Minor formatting improvements and comment correction
ggt/modules/result_aggregator.py	Removes extra blank lines for consistency
docs/source/conf.py	Code formatting improvements and adds strikethrough extension
Makefile	Updates download URLs for demo data