pkg: Update debian and binary runners to ubuntu-18.04

Author: qzed

.github/workflows/ci.yml

@@ -59,7 +59,7 @@ jobs:
     if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags/')
 
     name: Build binary package
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-18.04
     needs: [lint, test]
 
     steps:
@@ -88,7 +88,7 @@ jobs:
     if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags/')
 
     name: Build deb package
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-18.04
     needs: [lint, test]
 
     steps: