CI: Update toolchain to ARC 2022.09-rc2

Use ARC GNU Toolchain 2022.09-rc2 for CI

Signed-off-by: Pavel Kozlov <pavel.kozlov@synopsys.com>

Author: pavelvkozlov

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ on:
   workflow_dispatch:
 
 env:
-  toolchain_ver: 2022.03-build002
+  toolchain_ver: 2022.09-rc2
   toolchain_url: https://github.com/foss-for-synopsys-dwc-arc-processors/arc-gnu-toolchain/releases/download/$toolchain_ver
 
 jobs: