ci: use github-hosted ubuntu runners

Author: steipete

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ concurrency:
 
 jobs:
   test:
-    runs-on: blacksmith-16vcpu-ubuntu-2404
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
@@ -31,7 +31,7 @@ jobs:
         run: make lint
 
   worker:
-    runs-on: blacksmith-16vcpu-ubuntu-2404
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6