Update CI

Author: John Garrett

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
       run:
         shell: bash -l {0}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: conda-incubator/setup-miniconda@v2
         with:
           python-version: ${{ matrix.python-version }}

.github/workflows/linter.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Lint
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Set up Python 3.8 environment
         uses: actions/setup-python@v1
         with: