Bump PostHog from 2.7.1 to 2.8.1

[dependabot]

Updated PostHog from 2.7.1 to 2.8.1.

Release notes

Sourced from PostHog's releases.

2.8.1

Patch Changes

• 60a2194: Preserve per-capture GeoIP override properties when super properties are configured.

2.8.0

Minor Changes

• 788d9e0: Support the early_exit filter option in local feature flag evaluation, mirroring the server-side evaluation engine. When a flag's filters.early_exit is true and a condition group's property filters match (or the group has none) but the rollout percentage excludes the user, evaluation stops and the flag returns a definitive disabled result instead of falling through to later condition groups. A pure property-filter mismatch always falls through, even when early_exit is enabled. When the field is absent or false, existing behavior is preserved.
• 788d9e0: Add feature flag evaluation contexts via PostHogOptions.EvaluationContexts. /flags requests now send evaluation_contexts when configured.
• 788d9e0: Add a configurable $is_server event property (default true) so PostHog can identify server-side events. Set PostHogOptions.IsServer to false when using the SDK as a client/CLI so the device OS is attributed normally.
• 788d9e0: Add request-scoped server request context support for tracing headers and ASP.NET Core metadata.

Patch Changes

• 788d9e0: Refactor duplicate internal SDK code paths without changing public API behavior.
• 788d9e0: Document public APIs and make GroupCollection.TryAdd(Group) store entries by group type instead of group key, matching the collection's one-group-per-type behavior.
• 788d9e0: Include group context in the $feature_flag_called dedupe cache 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 (distinctId, featureKey, response) was seen under. The groups are canonicalized order-independently (OrderBy(GroupType, StringComparer.Ordinal)) so two equal collections built in different insertion orders still dedupe.
• 788d9e0: Return no-op results instead of throwing from public APIs when PostHog API calls fail.
• 788d9e0: Reject semver values with leading zeros in local flag evaluation. Per semver 2.0.0 §2, numeric identifiers must not include leading zeros — values like 1.07.3 are not valid semver and should not match targeting conditions. Both override values and flag values are now validated; invalid inputs cause SemanticVersion.TryParse to return false so the condition does not match.
• 788d9e0: Use the correct historical_migration wire field for batch capture payloads.

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