fix(deps): update module github.com/openfga/openfga to v1.8.15

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/openfga/openfga	v1.8.13 -> v1.8.15

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Release Notes

openfga/openfga (github.com/openfga/openfga)

v1.8.15

Compare Source

Changelog

1.8.15 - 2025-06-11

Added

• Add support for separate read and write datastores for PostgreSQL. #​2479

Fixed

• Improve Check performance for models with recursion and enable-check-optimizations experiment flag is enabled. #​2492
• Reverts the base docker image back to cgr.dev/chainguard/static #​2473
• Fix for picking up env vars for migrate pkg #​2493

v1.8.14

Compare Source

Changelog

1.8.14 - 2025-06-10

Fixed

• Performance improve for SQL based datastore by reducing connection usage during IsReady check. #​2483
• SQL drivers now respect zero value for MaxOpenConns, ConnMaxIdleTime, ConnMaxLifetime. #​2484
• When enable-check-optimizations experiment flag is enabled, incorrect check for model with recursion and user is assigned to more than 100 groups due to iteratorToUserset not handling multiple messages incorrectly. #​2491
• Correlate storage context with caller's context. #​2292

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[renovate]

ℹ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 5 additional dependencies were updated

Details:

Package	Change
github.com/openfga/language/pkg/go	v0.2.0-beta.2.0.20250220223040-ed0cfba54336 -> v0.2.0-beta.2.0.20250428093642-7aeebe78bbfe
sigs.k8s.io/controller-runtime	v0.20.4 -> v0.21.0
github.com/oklog/ulid/v2	v2.1.0 -> v2.1.1
gonum.org/v1/gonum	v0.15.1 -> v0.16.0
k8s.io/apiextensions-apiserver	v0.32.1 -> v0.33.0