Update dependencies

[greglboxer]

Dependencies Updated:

• SQLAlchemy: ^1.0 → ^2.0
• Python: ^3.7 → ^3.10 (required by SQLAlchemy v2)
• jsonschema: ^3 → ^4
• PyYAML: ^5 → ^6
• Flask-SQLAlchemy: ^2 → ^3
• typing_extensions: ^4.6
• Removed sqlalchemy-stubs (now built into SQLAlchemy v2)
• Removed pytest-flake8 (incompatible with flake8 v7.3)

Code Updates:

• Migrated declarative_base import from sqlalchemy.ext.declarative to sqlalchemy.orm
• Replaced deprecated engine.execute() with engine.connect() context manager pattern
• Added text() wrapper for raw SQL queries
• Removed checks for internal SQLAlchemy relationship attributes (.secondary, .order_by)
• Updated pytest configuration: --strict → --strict-markers

Test Fixes:

• Updated version strings to PEP 440 compliant format ("version 1" → "1.0.0")
• Replaced obsolete wheel import error test with build error test
• Updated mypy output expectations for SQLAlchemy v2 type hints
• Fixed 9 test files using old declarative_base import