Migrate to new bare metal runner (Ubuntu 24)

Replace `oracle-bare-metal-64cpu-512gb-x86-64` with `oracle-bare-metal-64cpu-1024gb-x86-64-ubuntu-24`.

The old Oracle Linux 8 runner is being decommissioned in favor of the new Ubuntu 24 runner.

Related: open-telemetry/community#3310
open-telemetry/community#3311

Author: trask

.github/workflows/benchmark.yml

@@ -28,7 +28,7 @@ jobs:
     permissions:
       contents: write # required for pushing to gh-pages branch
     name: Benchmarks
-    runs-on: oracle-bare-metal-64cpu-512gb-x86-64
+    runs-on: oracle-bare-metal-64cpu-1024gb-x86-64-ubuntu-24
     strategy:
       matrix:
         shard: ${{ fromJson(needs.sharding-benchmark.outputs.shards) }}