Update enzyme-mlir.yml (#2295)

diff --git a/.github/workflows/enzyme-mlir.yml b/.github/workflows/enzyme-mlir.yml
index 16b3fe6..ff5d932 100644
--- a/.github/workflows/enzyme-mlir.yml
+++ b/.github/workflows/enzyme-mlir.yml
@@ -19,7 +19,7 @@
       matrix:
         build: ["Release", "Debug"] # "RelWithDebInfo"
         llbuild: ["Release"]
-        os: [openstack22]
+        os: [openstack22-large]
 
     timeout-minutes: 500