[Chore] Bump version of actions/checkout in lint task

v3 emits a warning in CI about the deprecation of node16.
Most of our CI workflows already use v4 of the checkout task,
so I'm comfortable commiting this change directly.

Author: jhamon

.github/workflows/lint.yaml

@@ -5,5 +5,5 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: chartboost/ruff-action@v1