Switch workflows to run on ubuntu-latest

Author: myabc

.github/workflows/test-selectors.yml

@@ -13,7 +13,7 @@ concurrency:
 jobs:
   selectors:
     name: CSS coverage
-    runs-on: ubuntu-latest-8-cores
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v6

.github/workflows/test-visual.yml

@@ -20,7 +20,7 @@ jobs:
     # Temp skip this run
     if: ${{ github.event_name == 'pull_request' && false }}
     timeout-minutes: 20
-    runs-on: ubuntu-latest-8-cores
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
         with: