Python 3.13 support

[dokterbob]

• Remove numpy dep: In light of Support for Python 3.13 #1428, I see no direct reference to numpy, so proposing to remove it as a direct dep.
• Run tests with Python 3.13
• Drop support for Python 3.9 (Python 3.13 requires scipy 1.14.1 which requires Python >3.10)
• Replace unmaintained asyncpg sqlalchemy backend
• Resolve Poetry installation failures
• Manual testing
• Run E2E tests with 3.13 at least once
• Update README
• Update docs
• Run tests in Python 3.13 open-telemetry/opentelemetry-python#4067