github: workflows: update sof-docs to a more recent stable release

This is step 1 to unblock the test and it will also need a commit in
sof-docs to re-enable. This commit wont fix by itself.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lrgirdwo

.github/workflows/sof-docs.yml

@@ -26,7 +26,7 @@ jobs:
   # example in
   # https://github.com/thesofproject/sof/pull/5731#issuecomment-1175630147
   sof-docs:
-    runs-on: ubuntu-20.04  # sof-docs is still stuck to this for now
+    runs-on: ubuntu-24.10
 
     steps:
       - uses: actions/checkout@v4