Update GitHub workflow images to ubuntu-24.04 (#200)

Author: IsaacG

.github/workflows/shellcheck.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   shellcheck:
     name: Run shellcheck on scripts
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332

.github/workflows/test.yml

@@ -14,7 +14,7 @@ on:
 jobs:
   verify_exercises:
     # TODO: replace with another image if required to run the tests (optional)
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
 
     steps:
       - name: Checkout repository