fix the test runner os

let's not get too wild

Author: uniphil

.github/workflows/checks.yml

@@ -11,7 +11,7 @@ env:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v4
     - name: Build lib
@@ -20,7 +20,7 @@ jobs:
       run: cargo test --verbose
 
   style:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v4
       - name: fmt