[Python SDK] Release 2.1.0

[SinchSDKTeam]

What's Changed

SDK

• [feature] OAuth token requests are now automatically retried (up to 3 times, with exponential backoff and jitter) when the authentication service is rate-limited (HTTP 429).
• [dependency] Set up minimum version for requests to >=2.0.0 to prevent pulling in versions with known vulnerabilities.
• [fix] Fixed a race condition in OAuth token creation and renewal under concurrent requests: TokenManagerBase now uses a lock with double-checked locking so the initial token is fetched exactly once, and a new refresh_auth_token(used_token) deduplicates concurrent renewals by only fetching when the stale token still matches the cached one.
• [refactor] HTTPTransport now prepares and authenticates requests in request(), so the new send_request(request_data) receives an already-prepared HttpRequest and acts as a pure I/O primitive, simplifying subclassing.
• [deprecation notice] HTTPTransport.send(endpoint) is deprecated in favour of send_request(request_data); the legacy method still works for backward compatibility, but will be removed in 3.0.
• [deprecation notice] TokenManagerBase.invalidate_expired_token() and handle_invalid_token() (and the TokenState.EXPIRED value) are deprecated and will be removed in 3.0, as token renewal now goes through refresh_auth_token().
• [tech] Removed unused GitHub environment secrets from CI workflow and simplified test fixtures to use hardcoded test values.
• [refactor] Consolidated the duplicated per-domain BaseModelConfiguration classes into three shared base classes in sinch.core.models.internal (BaseConfigModel, SnakeCaseExtrasModel, CamelCaseDumpModel).
• [doc] Improve README structure and content.

SMS

• [feature] SMS Groups API: create, list, get, update, replace, delete, and list_members operations, with full model, endpoint, and unit test coverage (see MIGRATION_GUIDE.md).
• [feature] SMS Inbounds API: get and list operations, with full model, endpoint, and unit test coverage (see MIGRATION_GUIDE.md).
• [design] SMS Sinch Events inbound payload models unified with the Inbounds API: MOTextSinchEvent, MOBinarySinchEvent, MOMediaSinchEvent, MediaBody, and MediaItem removed from sinch_events; use InboundMessage (and its variants) from sinch.domains.sms.models.v1.types instead (see MIGRATION_GUIDE.md).

Numbers

• [feature] NumberSinchEvent synchronized with the Numbers OAS spec: new internal_failure_code field, additional status values (IN_REVIEW, BLOCKED, COMPLETED, REJECTED, EXPIRED), a new NUMBER_ORDER_PROCESSING event type, and corrected event type DEPROVISIONING_FROM_VOICE_PLATFORM (previously DEPROVISIONING_TO_VOICE_PLATFORM).

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