Update dependency posthog to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
posthog	^5.0.0 -> ^6.0.0

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Release Notes

posthog/posthog-python (posthog)

v6.7.0

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• feat: Add support for feature flag dependencies

v6.6.1

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• fix: Prevent NoneType error when group_properties is None

v6.6.0

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• feat: Add flag_keys_to_evaluate parameter to optimize feature flag evaluation performance by only evaluating specified flags
• feat: Add flag_keys_filter option to send_feature_flags for selective flag evaluation in capture events

v6.5.0

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• feat: Add $context_tags to an event to know which properties were included as tags

v6.4.1

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• fix: Always pass project API key in remote_config requests for deterministic project routing

v6.4.0

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• feat: support Vertex AI for Gemini

v6.3.4

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• fix: set $ai_tools for all providers and $ai_output_choices for all non-streaming provider flows properly

v6.3.3

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• fix: get_feature_flag_result now correctly returns FeatureFlagResult when payload is empty string instead of None

v6.3.2

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• fix: Anthropic's tool calls are now handled properly

v6.3.1: 6.3.1

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v6.3.0

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• feat: Enhanced send_feature_flags parameter to accept SendFeatureFlagsOptions object for declarative control over local/remote evaluation and custom properties

v6.2.1

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• feat: make posthog_client an optional argument in PostHog AI providers wrappers (posthog.ai.*), intuitively using the default client as the default

v6.1.1

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• fix: correctly capture exceptions processed by Django from views or middleware

v6.1.0

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• feat: decouple feature flag local evaluation from personal API keys; support decrypting remote config payloads without relying on the feature flags poller

v6.0.4

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• fix: add POSTHOG_MW_CLIENT setting to django middleware, to support custom clients for exception capture.

v6.0.3

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• feat: add a feature flag evaluation cache (local storage or redis) to support returning flag evaluations when the service is down

v6.0.2

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• fix: send_feature_flags changed to default to false in Client::capture_exception

v6.0.1

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• fix: response $process_person_profile property when passed to capture

v6.0.0

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This release contains a number of major breaking changes:

• feat: make distinct_id an optional parameter in posthog.capture and related functions
• feat: make capture and related functions return Optional[str], which is the UUID of the sent event, if it was sent
• fix: remove identify (prefer posthog.set()), and page and screen (prefer posthog.capture())
• fix: delete exception-capture specific integrations module. Prefer the general-purpose django middleware as a replacement for the django Integration.

To migrate to this version, you'll mostly just need to switch to using named keyword arguments, rather than positional ones. For example:

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