Fix typo for continuous-integration

Author: srvasude

.github/workflows/continuous-integration.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   run_tests:
     name: Run tests
-    runs-on: ubunut-latest
+    runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
       - name: Checking out repository