Fix "Couldn't find any package by regex 'python3.11-venv'" (#759)

To address recent failures from linter CI:
```bash
E: Unable to locate package python3.11-venv
E: Couldn't find any package by glob 'python3.11-venv'
E: Couldn't find any package by regex 'python3.11-venv'
```

This is likely due to the new Ubuntu version (noble) does not have
`python3.11-venv`, but we don't have to install it anyway.

.github/workflows/lint.yaml

@@ -31,8 +31,6 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.11'
-      - name: Install venv
-        run: sudo apt-get install python3.11-venv
       - name: Set up venv
         run: python3.11 -m venv .venv
       - name: Active venv dependencies