ci: workflows get only read access; drop the disabled CodeQL workflow

The test and lint workflows set no permissions, so their GITHUB_TOKEN
had the repository's default access (CodeQL
actions/missing-workflow-permissions). Both only check out and build
the code: they now ask for contents: read.

.github/workflows/codeql-analysis.yml was disabled on GitHub; code
scanning runs through GitHub's default CodeQL setup instead. The file
only kept the old analysis category (and its 2023 alerts) around.

.github/workflows/codeql-analysis.yml

@@ -1,61 +0,0 @@
-# For most projects, this workflow file will not need changing; you simply need
-# to commit it to your repository.
-#
-# You may wish to alter this file to override the set of languages analyzed,
-# or to provide custom queries or build logic.
-name: "CodeQL"
-
-on:
-  push:
-    branches: [master]
-  pull_request:
-    branches: [master]
-  schedule:
-    - cron: '0 21 * * 3'
-
-jobs:
-  analyze:
-    name: Analyze
-    runs-on: ubuntu-latest
-
-    strategy:
-      fail-fast: false
-      matrix:
-        # Override automatic language detection by changing the below list
-        # Supported options are ['csharp', 'cpp', 'go', 'java', 'javascript', 'python']
-        language: ['javascript', 'python']
-        # Learn more...
-        # https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#overriding-automatic-language-detection
-
-    steps:
-    - name: Checkout repository
-      uses: actions/checkout@v4
-
-    # Initializes the CodeQL tools for scanning.
-    - name: Initialize CodeQL
-      uses: github/codeql-action/init@v3
-      with:
-        languages: ${{ matrix.language }}
-        # If you wish to specify custom queries, you can do so here or in a config file.
-        # By default, queries listed here will override any specified in a config file. 
-        # Prefix the list here with "+" to use these queries and those in the config file.
-        # queries: ./path/to/local/query, your-org/your-repo/queries@main
-
-    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
-    # If this step fails, then you should remove it and run the build manually (see below)
-    - name: Autobuild
-      uses: github/codeql-action/autobuild@v3
-
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 https://git.io/JvXDl
-
-    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
-    #    and modify them (or add more) to build your code if your project
-    #    uses a compiled language
-
-    #- run: |
-    #   make bootstrap
-    #   make release
-
-    - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v3

.github/workflows/linter.yml

@@ -6,6 +6,10 @@ on:
   pull_request:
     branches: [master]
 
+# the jobs only read the code
+permissions:
+  contents: read
+
 jobs:
   ruff:
     name: Ruff

.github/workflows/test.yml

@@ -6,6 +6,10 @@ on:
   pull_request:
     branches: [master]
 
+# the jobs only read the code
+permissions:
+  contents: read
+
 jobs:
   test:
     name: Python ${{ matrix.python-version }}