Update dependency testfixtures to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
testfixtures	^8.3.0 -> ^9.1.0

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Release Notes

Simplistix/testfixtures (testfixtures)

v9.1.0

Compare Source

• Add support for passing :class:StringComparison instances as parameters to
  :meth:OutputCapture.compare.

v9.0.1

Compare Source

• :attr:ShouldRaise.raised is now always an exception instance. If no exception has been raised,
  it will be a :class:~testfixtures.shouldraise.NoException instance. This prevents typing
  complaints around using an attribute that might be None.

• :func:mock_time has been reworked to return an instance of :class:~testfixtures.datetime.MockTime rather than the
  class itself. :class:~testfixtures.datetime.MockTime has also been reworked such that it can no longer be instantiated
  with the same parameters as :class:~datetime.datetime - this edge case was never supported,
  but is highlighted here in case folks were using it.

v9.0.0

Compare Source

• Python 3.11 is now the minimum supported version.

• A show_whitespace parameter has been added to :class:ShouldAssert.

• testfixtures is now fully typed, checked with mypy__ and is distributed with
  a py.typed marker file.

  __ https://mypy.readthedocs.io/en/stable/

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
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The artifact failure details are included below:

File name: poetry.lock

Updating dependencies
Resolving dependencies...


The current project's supported Python range (>=3.9,<3.13) is not compatible with some of the required packages Python requirement:
  - testfixtures requires Python >=3.11, so it will not be installable for Python >=3.9,<3.11

Because no versions of testfixtures match >9.1.0,<10.0.0
 and testfixtures (9.1.0) requires Python >=3.11, testfixtures is forbidden.
So, because runway depends on testfixtures (^9.1.0), version solving failed.

  * Check your dependencies Python requirement: The Python requirement can be specified via the `python` or `markers` properties

    For testfixtures, a possible solution would be to set the `python` property to ">=3.11,<3.13"

    https://python-poetry.org/docs/dependency-specification/#python-restricted-dependencies,
    https://python-poetry.org/docs/dependency-specification/#using-environment-markers

[ITProKyle]

Closing as this dependency is soon to be removed.

[renovate]

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