CI: Change the deploy-schema CI job to run on ubuntu-latest (#77)

Author: DilumAluthge

.github/workflows/deploy-schema.yml

@@ -24,7 +24,7 @@ env:
 
 jobs:
   deploy-schema:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # 6.0.2