fix(deps): update dependency unleashclient to v6

[red-hat-konflux]

This PR contains the following updates:

Package	Change	Age	Confidence
UnleashClient (changelog)	~=5.11 -> ~=6.4

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Release Notes

Unleash/unleash-python-sdk (UnleashClient)

v6.4.1

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What's Changed

• fix: client initialization error with bootstrapped cache by @​ErliSoares in #​385

New Contributors

• @​ErliSoares made their first contribution in #​385

Full Changelog: Unleash/unleash-python-sdk@v6.4.0...v6.4.1

v6.4.0

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• (Minor) Added experimental streaming support.
• (Bugfix) The SDK should shutdown gracefully in a threaded environment, rather than raising an error.

v6.3.0

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• (Minor) Added 'fetch' and 'ready' lifecycle events.

v6.2.2

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• (Bugfix) Arbitrary properties are now allowed in context fields, so long as they have a reasonable string representation.

v6.2.1

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• (Bugfix) Flush metrics if destroy()ing client.

v6.2.0

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• (Minor) add unleash interval headers and connection id to payloads

v6.1.0

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• (Minor) standardised client identification headers

v6.0.1

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• (Minor) Use PyPi Publish Github actions
• (Bugfix) Fix permissions for doc publishing
• (Bugfix) custom context properties are respected during evaluation

v6.0.0

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• (Major) swap core for yggdrasil
• (Documentation) v6 migration guide
• (Bugfix) handle cases where the response from upstream is a bad

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