Update dependency mock to v4.0.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mock (source)	==4.0.2 -> ==4.0.3

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Release Notes

testing-cabal/mock

v4.0.3

Compare Source

• bpo-42532: Remove unexpected call of __bool__ when passing a
  spec_arg argument to a Mock.

• bpo-39966: Revert bpo-25597. :class:unittest.mock.MagicMock with
  wraps' set uses default return values for magic methods.

• bpo-41877: Mock objects which are not unsafe will now raise an
  AttributeError if an attribute with the prefix asert, aseert, or assrt is
  accessed, in addition to this already happening for the prefixes assert or
  assret.

• bpo-40126: Fixed reverting multiple patches in unittest.mock. Patcher's
  __exit__() is now never called if its __enter__() is failed.
  Returning true from __exit__() silences now the exception.

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