run on ubuntu-latest

ref https://juliahub.slack.com/archives/C01QED7M6JF/p1720032594921189?thread_ts=1718209193.351529&cid=C01QED7M6JF

Author: baggepinnen

.github/workflows/CI.yml

@@ -13,14 +13,14 @@ env:
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
-    runs-on: self-hosted
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         version:
           - '1'
         os:
-          - self-hosted
+          - ubuntu-latest
         arch:
           - x64
     steps: