Ubuntu 18.04 [deprecated]

https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners

Signed-off-by: Sakshi Aggarwal <81718060+sakshiagrwal@users.noreply.github.com>

.github/workflows/Recovery Build.yml

@@ -45,8 +45,7 @@ on:
 jobs:
   build:
     if: github.event.repository.owner.id == github.event.sender.id
-    runs-on: ubuntu-18.04
-    # You can use either of the ubuntu-18.04 or ubuntu-20.04 runner
+    runs-on: ubuntu-20.04
     steps:
     - name: Display Run Parameters
       run: |