Snowfakery v3.6.3

What's Changed

• Clean up warnings in tests and at runtime. by @prescod in #1027
• Clean up temporary directories after closing iterator by @prescod in #1029
• Make recent versions of pyright happy by @prescod in #1028
• Let mkdocs float by @prescod in #1031
• Let SQLAlchemy float by @prescod in #1032
• W17 Dependency updates by @jstvz in #1043

Full Changelog: v3.6.2...v3.6.3