chore: CI: disable large runner again

.github/workflows/ci.yml

@@ -56,8 +56,8 @@ jobs:
             const quick = ${{ steps.set-quick.outputs.quick }};
             console.log(`quick: ${quick}`);
             // use large runners outside PRs where available (original repo)
-            // for now Windows only, which is the slowest non-debug job
-            let large = ${{ github.event_name != 'pull_request' && github.repository == 'leanprover/lean4' }} ? "-large" : "";
+            // disabled for now as this mostly just speeds up the test suite which is not a bottleneck
+            // let large = ${{ github.event_name != 'pull_request' && github.repository == 'leanprover/lean4' }} ? "-large" : "";
             let matrix = [
               {
                 // portable release build: use channel with older glibc (2.27)
@@ -138,7 +138,7 @@ jobs:
               },
               {
                 "name": "Windows",
-                "os": `windows-2022${large}`,
+                "os": "windows-2022",
                 "release": true,
                 "quick": false,
                 "shell": "msys2 {0}",