fix: specify ubuntu-22.04 during GH actions transition period to ubuntu-24.04

See actions/runner-images#10636

Signed-off-by: deadprogram <ron@hybridgroup.com>

Author: deadprogram

.github/workflows/linux.yml

@@ -169,7 +169,7 @@ jobs:
   assert-test-linux:
     # Run all tests that can run on Linux, with LLVM assertions enabled to catch
     # potential bugs.
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4