build(deps-dev): bump matter-python-client from 1.1.7 to 1.2.1

[dependabot]

Bumps matter-python-client from 1.1.7 to 1.2.1.

Release notes

Sourced from matter-python-client's releases.

Release v1.2.1

Official release, check CHANGELOG.md for details

Release v1.2.0

Official release, check CHANGELOG.md for details

Changelog

Sourced from matter-python-client's changelog.

1.2.1 (2026-07-09)

• Fix: Optimize WebSocket backpressure calculation so a single large payload no longer trips congestion mode on a healthy client

1.2.0 (2026-07-09)

• Feature: Enhanced Thread Network diagnostics — collect and visualize per-Thread-network diagnostics also from Border Routers over MeshCoP (CoAP/DTLS) or the OTBR REST API (auto-selected, cached)
• Feature: Adds WiFi and Thread credential management and allows to store multiple entries. Commissioning can pick which stored network to use
• Feature: Adds ICD (Intermittently Connected Device) management including a "Power & Sleep (ICD)" dashboard panel. Requires devices with Matter 1.4+ for LIT management.
• Feature: Allows defining the default fabric label to use as CLI/ENV-option which then blocks changing via the WebSocket API
• Feature: Adds automatic time synchronization for devices that support it, pushing host time (UTC and time zone / DST). Enable it with the --enable-time-sync CLI option (env ENABLE_TIME_SYNC) when the host has a reliable, synced time source. Runs first 30-60 minutes after start, then every 24h.
• Enhancement: When one WebSocket connection defines a fabric label then other connections are blocked from changing that as long as the defining connection is still active
• Enhancement: Introduced WS schema 12 which supports the above features — see WebSocket API schema changelog.
• Enhancement: New --disable-thread-diagnostics CLI flag (env DISABLE_THREAD_DIAGNOSTICS) turns off the entire Thread Border Router subsystem (discovery, probing, diagnostics) for plain Matter-controller deployments. Matter-over-Thread commissioning is unaffected
• Enhancement: WebSocket sends now apply per-connection backpressure — a slow or stalled client coalesces attribute/node updates and drops stale events instead of buffering without limit, preventing unbounded memory growth (OOM) under high event volume
• Enhancement: Update matter.js to the latest 0.17.5 nightly
  • Adds support for Matter 1.6.0
  • Adds support for ICD (SIT and LIT) devices
  • Fixes an invoke-issue where parallel multi-endpoint invokes were working but errors returned on WebSocket
  • Optimizes subscription reporting intervals
  • Ensures changed node structures are sent via WebSocket directly after re-subscribe and not delayed
• Adjustment: webrtc_callback events are now delivered only to the connection that issued the send_webrtc_provider_command for that camera session, instead of being broadcast to every connected client
• Fix: Ensures that the Python-Client does not crash anymore on unknown events from newer Server versions

Commits

• dd148f8 [OFFICIAL RELEASE] 1.2.1 (#837)
• c3d7855 fix: scale WebSocket backpressure high-water mark to the largest frame (#836)
• 3ba0947 [OFFICIAL RELEASE] 1.2.0 (#834)
• e40498d chore: update matter.js and use Timestamp.toMicroseconds for TimeSync epoch-u...
• 67d08f0 refactor(ws-client): tidy topology follow-ups from #829 review (#831)
• 7f4216c refactor(ws-client): extract shared Thread/WiFi topology derivation (#829)
• 5e00c1b feat: tri-state ICD badge, clearer LIT wording, versioned update dialog (#830)
• 836885e Add TimeSync support for nodes with TimeSynchronization cluster (#440)
• 48a0274 feat: add get_fabric_label WS command and --default-fabric-label pin (#826)
• 0453b02 fix: apply per-connection WebSocket backpressure to prevent OOM (#825)
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)