[CI] Bump CI Container Version (#417)

We recently bumped the CI container from Ubuntu 22.04 to 24.04 in the
monorepo. This patch bumps the version here to keep up with the updates,
especially given that the bump means the 22.04 version is not really
supported/maintained upstream anymore.

Author: boomanaiden154

Diff for: premerge/linux_runners_values.yaml

@@ -18,7 +18,7 @@ template:
       premerge-platform: linux
     containers:
     - name: runner
-      image: ghcr.io/llvm/ci-ubuntu-22.04-agent:latest
+      image: ghcr.io/llvm/ci-ubuntu-24.04-agent:latest
       command: ["/home/gha/actions-runner/run.sh"]
       resources:
         # If we don't set the CPU request high-enough here, 2 runners might