Adapt SCTP/DataChannels API to latest changes in mediasoup (#376)

* Adapt SCTP/DataChannels API to latest changes in mediasoup

# Details

- **[BREAKING CHANGE]** Remove `device.sctpCapabilities`. Why? See next bullet.
- **[BREAKING CHANGE]** Remove `SctpCapabilities` type because it only contains `OS` and `MIS` which are hardcoded max number of outgoing and incoming SCTP streams, which means nothing because those values are later negotiated during the SCTP association handshake with the peer.
- Improve the way next sendong DataChannel `id` is computed by using the real negotiated max number of outgoing SCTP streams.
- Update deps.

## TODO

* [ ] Update docs.

* CI: add ubuntu-26.04

* cosmetic

Author: ibc

.github/workflows/mediasoup-client.yaml

@@ -21,14 +21,16 @@ jobs:
             node: 22
           - os: ubuntu-24.04
             node: 24
+          - os: ubuntu-26.04
+            node: 26
           - os: macos-14
             node: 22
           - os: macos-15
-            node: 24
+            node: 26
           - os: windows-2022
-            node: 22
-          - os: windows-2025
             node: 24
+          - os: windows-2025
+            node: 26
 
     runs-on: ${{ matrix.ci.os }}