fix tests on Go 1.26 (#1634)

Add x-stableId to supported schema fields (#1632)

The OpenAPI spec v2250+ includes a new `x-stableId` field for tracking
stable schema identifiers across spec versions. stripe-mock's custom
JSON unmarshaler rejects unknown fields, causing a crash on startup.

Add the field to the allowlist so it is tolerated during parsing.


Committed-By-Agent: claude

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

OpenAPI Update (#1560)

Update OpenAPI for 671bbd38f1ee8088d7a836892c24c570827cbcc0

Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>

OpenAPI Update (#1477)

Update OpenAPI for 467091a4b63fddc62d4db6b44f9f017552d8b5d5

Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>

OpenAPI Update (#1289)

Update OpenAPI for a2daacd414ad5c3cf88d79a4214e35595b239490

Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>

OpenAPI Update (#1272)

* Update OpenAPI for c23be6a8e5e8778c1e7ecba3d52554a29b58ea27

* manually updated fixtures

---------

Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>
Co-authored-by: Jesse Rosalia <jar@stripe.com>

OpenAPI Update (#1181)

Update OpenAPI for 8ff0a5fd272923306f48efe24a5b3b2e3f367930

Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>

Make branch name configurable in update-openapi-spec (#962)

OpenAPI Update (#960)

* Update OpenAPI for a6beefc06642e5d66dbd7cbf0d11aeb59368149f

* fix tests

---------

Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>
Co-authored-by: David Brownman <xavdid@stripe.com>

OpenAPI Update (#958)

* Update OpenAPI for d5c0875f9c7bda6824c65f4bd658378004c4c5bf

* fix tests

---------

Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>
Co-authored-by: David Brownman <xavdid@stripe.com>