chore(deps): update dependency snapshottest to v0.6.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
snapshottest	minor	==0.5.1 -> ==0.6.0

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Release Notes

syrusakbary/snapshottest

v0.6.0

Compare Source

New features

• Sort written snapshots.
• Extract Django TestRunner to a mixin so it can be used with alternative base
  classes.

Bug fixes

• Handle SortedDict with keys other than strings.
• Fix error when snapshotting mock Calls objects.
• Fix formatting of float("nan") and float("inf").
• Adopt a valid PEP-508 version range for fastdiff.

Other changes

• Documentation improvements.
• Add tests and changelog to sdist.

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