Make config test options not unknown types

[palfrey]

pyright in strict mode complains about the test options having an unknown type, which this fixes

/home/palfrey/src/sked/sked/settings.py:89:16 - error: Type of "config" is partially unknown
Type of "config" is "(env: str = DEFAULT_ENV, default: str | None = None, engine: str | None = None, conn_max_age: int | None = 0, conn_health_checks: bool = False, disable_server_side_cursors: bool = False, ssl_require: bool = False, test_options: Dict[Unknown, Unknown] | None = None) -> DBConfig" (reportUnknownMemberType)

This also explicitly adds pyright support to the CI to avoid this happening again

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (5106a19) to head (1ac6257).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #252   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           76        76           
  Branches        18        18           
=========================================
  Hits            76        76           

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[palfrey]

Any thoughts @mattseymour ?