Fix a few simple workflow lint errors (github#17298)

JamesMGreene · web-flow · commit fb0f3846b61c · 2021-01-15T14:01:17.000Z
* Use 'ubuntu-latest' instead of 'ubuntu-18.04' for longevity
* Update 'branches' configurations to be sequences as expected
diff --git a/.github/workflows/autoupdate-branch.yml b/.github/workflows/autoupdate-branch.yml
@@ -7,7 +7,7 @@ jobs:
   autoupdate:
     if: github.repository == 'github/docs-internal' || github.repository == 'github/docs'
     name: autoupdate
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
       - uses: docker://chinthakagodawita/autoupdate-action:v1
         env:
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
@@ -2,9 +2,11 @@ name: CodeQL analysis
 
 on:
   push:
-    branches: main
+    branches:
+      - main
   pull_request:
-    branches: main
+    branches:
+      - main
     paths:
       - '**/*.js'
       - '.github/workflows/codeql.yml'
