[release/v7.4] Switch to ubuntu-lastest for CI (PowerShell#25406)

Co-authored-by: Travis Plunk <[email protected]>

Author: pwshBot

.github/workflows/linux-ci.yml

@@ -70,7 +70,7 @@ jobs:
 
   ci_build:
     name: Build PowerShell
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     needs: changes
     if: ${{ needs.changes.outputs.source == 'true' }}
     steps:
@@ -87,7 +87,7 @@ jobs:
       - ci_build
       - changes
     if: ${{ needs.changes.outputs.source == 'true' }}
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: checkout
         uses: actions/[email protected]
@@ -104,7 +104,7 @@ jobs:
       - ci_build
       - changes
     if: ${{ needs.changes.outputs.source == 'true' }}
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: checkout
         uses: actions/[email protected]
@@ -121,7 +121,7 @@ jobs:
       - ci_build
       - changes
     if: ${{ needs.changes.outputs.source == 'true' }}
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: checkout
         uses: actions/[email protected]
@@ -138,7 +138,7 @@ jobs:
       - ci_build
       - changes
     if: ${{ needs.changes.outputs.source == 'true' }}
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: checkout
         uses: actions/[email protected]