lint: update checkout and setup-python action versions

Signed-off-by: Daniel Swarbrick <[email protected]>

.github/workflows/lint.yml

@@ -9,14 +9,14 @@ jobs:
   flake8:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
-          python-version: '3.11'
+          python-version: '3.12'
       - uses: py-actions/flake8@v2
 
   shellcheck:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ludeeus/action-shellcheck@master