deps: update posthog requirement from >=7.0.0 to >=7.18.0 in /backend

[dependabot]

Updates the requirements on posthog to permit the latest version.

Release notes

Sourced from posthog's releases.

7.18.0

Minor changes

• a2ce51e feat(feature-flags): support the early_exit condition option in local evaluation. When a flag enables early exit, evaluation now stops and returns False as soon as a condition group's property filters match but the rollout percentage excludes the user, instead of falling through to later groups — matching the server-side evaluation behavior. — Thanks @​gustavohstrassburger!

Changelog

Sourced from posthog's changelog.

7.18.0 — 2026-06-05

Minor changes

• a2ce51e feat(feature-flags): support the early_exit condition option in local evaluation. When a flag enables early exit, evaluation now stops and returns False as soon as a condition group's property filters match but the rollout percentage excludes the user, instead of falling through to later groups — matching the server-side evaluation behavior. — Thanks @​gustavohstrassburger!

7.17.0 — 2026-06-03

Minor changes

• 3aed638 Add a configurable $is_server event property (default true) so PostHog can identify server-side events. Set is_server=False when using posthog-python as a client/CLI so the device OS is attributed normally. — Thanks @​turnipdabeets for your first contribution 🎉!

7.16.4 — 2026-06-03

Patch changes

• 44e6b14 Fix async streaming responses from the AI wrappers (OpenAI, Anthropic, Gemini) so they support async with as well as async for. Previously, consuming a stream via async with (e.g. with pydantic-ai) raised TypeError: 'async_generator' object does not support the asynchronous context manager protocol. — Thanks @​turnipdabeets for your first contribution 🎉!

7.16.3 — 2026-06-01

Patch changes

• 643a810 Return empty flag defaults from Client flag helpers when the flags API fails. — Thanks @​marandaneto!

7.16.2 — 2026-05-28

Patch changes

• 034dce2 Make module-level setup no-op when API key is blank — Thanks @​marandaneto!

7.16.1 — 2026-05-27

Patch changes

• 8f6d6c8 Include group context in the $feature_flag_called dedupe key so group-scoped flags fire a separate event for each group a user is evaluated under, instead of being dedup-ed against the first group context the same (distinct_id, flag, response) was seen under. — Thanks @​gustavohstrassburger!

7.16.0 — 2026-05-27

Minor changes

• a44e0be Add async flag definition cache providers — Thanks @​dustinbyrne!

7.15.4 — 2026-05-25

Patch changes

• 0207088 Track OpenAI chat completions parse calls — Thanks @​marandaneto!

7.15.3 — 2026-05-21

... (truncated)

Commits

• 98e9b71 chore: Release v7.18.0 [skip ci]
• a2ce51e feat(feature-flags): support early_exit in local evaluation (#648)
• 1117c5e ci: consolidate Dependabot skip into reusable flags-board workflow (#653)
• 97c11ad ci: skip flags project board workflow for Dependabot PRs (#652)
• b9b198e chore(deps): bump the ai-providers group across 1 directory with 8 updates (#...
• b141bed chore(deps): bump starlette from 1.0.0 to 1.0.1 in /examples/example-ai-seman...
• 6465e05 chore(deps): bump starlette from 1.0.0 to 1.0.1 in /examples/example-ai-opena...
• ea9d041 chore(deps): bump starlette from 1.0.0 to 1.0.1 in /examples/example-ai-pydan...
• a91ca2b chore: Update Sentry license attribution (#647)
• 9bc9015 Update generated references
• Additional commits viewable in compare view

[dependabot]

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