Use large runners for rust tests to avoid disk space flakes

PiperOrigin-RevId: 680695472

Author: mkruskal-google

.github/workflows/test_rust.yml

@@ -15,7 +15,7 @@ jobs:
   # This job should be run on presubmit, if any continuous-only tests are added we will need to input test-type above
   linux:
     name: Linux
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22-4core
     steps:
       - name: Checkout pending changes
         uses: protocolbuffers/protobuf-ci/checkout@v3