github: workflow: use 24.04LTS for testbench build

The 24.10 runner availability is not great and 24.10 is not
strictly needed, so use 24.04LTS instead.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

.github/workflows/testbench.yml

@@ -30,7 +30,7 @@ on:
 
 jobs:
   build-and-test:
-    runs-on: ubuntu-24.10
+    runs-on: ubuntu-24.04
 
     steps:
       - name: Checkout SOF repository (PR source)
@@ -42,7 +42,7 @@ jobs:
         run: sudo apt-get update &&
                sudo apt-get -y install valgrind ninja-build
                   octave octave-signal automake autoconf libtool
-                  gettext linux-headers-6.11.0-8
+                  gettext linux-libc-dev
 
       - name: Build Alsa-lib
         run: |