[nrf noup] Bump the Ubuntu version for release tools.

Ubuntu 20.04 is deprecated and cannot be used to run build of the
release tools. The deprecation took place on 15.04.2025.

Switched to the next stable version: 22.04.

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

Author: ArekBalysNordic

.github/workflows/release_tools.yaml

@@ -30,13 +30,13 @@ jobs:
         name: Build CHIP Tools
         timeout-minutes: 60
 
-        runs-on: ubuntu-20.04
+        runs-on: ubuntu-22.04
 
         env:
             DEBIAN_FRONTEND: noninteractive
 
         container:
-            image: ubuntu:20.04
+            image: ubuntu:22.04
             volumes:
                 - "/tmp/log_output:/tmp/test_logs"
                 - "/tmp/output_binaries:/tmp/output_binaries"