downgrade ubuntu

Author: Strilanc

.github/workflows/ci.yml

@@ -453,7 +453,7 @@ jobs:
       - run: pytest glue/zx
       - run: dev/doctest_proper.py --module stimzx
   test_stimjs:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v3
       - uses: mymindstorm/setup-emsdk@v14