Update databases/py-peewee to 3.0.13

3.0.13
- Fix bug where simple field aliases were being ignored.
- More strict about column type inference for postgres + pwiz.

3.0.12
- Fix queries of the form INSERT ... VALUES (SELECT...) so that
  sub-select is wrapped in parentheses.
- Improve model-graph resolution when selecting from multiple tables
  that are joined by foreign-keys, and an intermediate table is
  omitted from selection.
- Docs update to reflect deletion of post_init signal.

3.0.11
- Add note to changelog about cursor() method.
- Add hash method to postgres indexedfield subclasses.
- Add TableFunction to sqlite_ext module namespace.
- Fix bug regarding NOT IN queries where the right-hand-side is an
  empty set.
- Fallback implementations of bm25f and lucene search ranking
  algorithms.
- Fixed DecimalField issue.
- Fixed issue with BlobField when database is a Proxy object.

(fhajny)