chore: Bump Azure.Messaging.ServiceBus from 7.20.2 to 7.21.0

[dependabot]

Updated Azure.Messaging.ServiceBus from 7.20.2 to 7.21.0.

Release notes

Sourced from Azure.Messaging.ServiceBus's releases.

7.21.0

7.21.0 (2026-10-06)

Features Added

• Added SqlFilterCount and CorrelationFilterCount properties to TopicRuntimeProperties, exposing the total number of SQL filters and correlation filters across all of a topic's subscriptions. These are populated by GetTopicRuntimePropertiesAsync and GetTopicsRuntimePropertiesAsync.
• Added ServiceBusAdministrationClientOptions.ServiceVersion.V2024_05 and made it the default service version. The topic filter counts above are served by the 2024-05 service API version, so the administration client now sends api-version=2024-05 by default.
• Added GetMessageSessionsAsync overloads on ServiceBusClient for queues and subscriptions. The no-filter overload returns the IDs of sessions that have active messages or session state, and the sessionStateUpdatedAfter overload returns session IDs whose session state was updated after the specified timestamp. Implements the com.microsoft:get-message-sessions AMQP management operation. (#​58761)
• Added opt-in support for non-exclusive session locking on ServiceBusSessionReceiver, allowing a session to be cooperatively taken over by another receiver. Set ServiceBusSessionReceiverOptions.EnableNonExclusiveSession to accept a session non-exclusively, then read the token from ServiceBusSessionReceiver.SessionLockToken and pass it as ServiceBusSessionReceiverOptions.SessionLockToken = Guid.Parse(token) to take that session over. ServiceBusSessionReceiver.IsSessionExclusive reports the mode the session was established under. Dispositions for a non-exclusive session are routed over the management link so that settlement keeps working across a takeover, which lowers settlement throughput compared to an exclusive session. This applies to ServiceBusSessionReceiver only; ServiceBusSessionProcessor continues to lock sessions exclusively. Accepting a session with EnableNonExclusiveSession set throws NotSupportedException when the endpoint declines it, either by refusing the request outright or by accepting it without assigning a lock token, which is how a caller detects whether the feature is available for a namespace. An endpoint that declines in some other way surfaces the exception its own error maps to. (#​60060)

Bugs Fixed

• Fixed retry classification for web socket failures with nested causes. On modern .NET, a transient network failure during a web socket connection attempt surfaces as a WebSocketException that wraps an HttpRequestException, which wraps the meaningful IOException or SocketException. The retry policy previously inspected only one level of nesting and treated these failures as terminal. The policy now unwraps nested wrapper exceptions to a bounded depth, so transient failures such as a connection reset use the configured retries. Terminal socket failures, such as host-not-found and host-unreachable, are not retried at any supported depth. A host-unreachable failure on an established connection is now terminal. Earlier versions retried it. (#​61868)

• Fixed a bug where canceling ServiceBusReceiver.CloseAsync left the receiver unable to close its own links. The receiver was marked as closed, and its set of locked messages disposed, before the cancellation was observed, so every later call to CloseAsync returned immediately without doing any work and the links stayed open until the owning ServiceBusClient was disposed. The receiver is now left open and closable when a close does not complete, so the operation can be retried. (#​59309)

Other Changes

• The default ServiceBusAdministrationClient service version is now 2024-05 (previously 2021-05). Existing operations are unaffected in behavior; the change is required to surface the new topic filter count properties.

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[dependabot]

Looks like Azure.Messaging.ServiceBus is no longer updatable, so this is no longer needed.