CI: add ubuntu-26.04

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 }}