manifest: update Matter SDK revision to pull CSL fix.

The newest Matter SDK revision contains a fix that repairs
a wrong casting in the CSL function.

Signed-off-by: Arkadiusz Balys <arkadiusz.balys@nordicsemi.no>

west.yml

@@ -147,7 +147,7 @@ manifest:
     - name: matter
       repo-path: sdk-connectedhomeip
       path: modules/lib/matter
-      revision: 08ae0cfe93cc766119547b3000a0419b81802ef8
+      revision: 834a21bf2b0f22b9e9af7adb6167041b3dbdebf8
       submodules:
         - name: nlio
           path: third_party/nlio/repo