Use Python 3.12 in coverage and query-list workflows

Replace Python 3.8, which is unavailable on Ubuntu 26.04 runners, in all six workflows that still pin it. Match the existing Python tooling workflow and quote the version to preserve it as a YAML string.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jketema

.github/workflows/csv-coverage-pr-artifacts.yml

@@ -47,10 +47,10 @@ jobs:
           git checkout HEAD^1
           git log -1 --format='%H'
         working-directory: base
-      - name: Set up Python 3.8
+      - name: Set up Python 3.12
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: "3.12"
       - name: Download CodeQL CLI
         uses: ./merge/.github/actions/fetch-codeql
       - name: Generate CSV files on merge commit of the PR

.github/workflows/csv-coverage-pr-comment.yml

@@ -25,10 +25,10 @@ jobs:
       run: echo "$GITHUB_CONTEXT"
     - name: Clone self (github/codeql)
       uses: actions/checkout@v5
-    - name: Set up Python 3.8
+    - name: Set up Python 3.12
       uses: actions/setup-python@v4
       with:
-        python-version: 3.8
+        python-version: "3.12"
 
     - name: Check coverage difference file and comment
       env:

.github/workflows/csv-coverage-timeseries.yml

@@ -20,10 +20,10 @@ jobs:
         with:
           path: codeqlModels
           fetch-depth: 0
-      - name: Set up Python 3.8
+      - name: Set up Python 3.12
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: "3.12"
       - name: Download CodeQL CLI
         uses: ./script/.github/actions/fetch-codeql
       - name: Build modeled package list

.github/workflows/csv-coverage-update.yml

@@ -25,10 +25,10 @@ jobs:
         with:
           path: ql
           fetch-depth: 0
-      - name: Set up Python 3.8
+      - name: Set up Python 3.12
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: "3.12"
       - name: Download CodeQL CLI
         uses: ./ql/.github/actions/fetch-codeql
       - name: Generate coverage files

.github/workflows/csv-coverage.yml

@@ -24,10 +24,10 @@ jobs:
         with:
           path: codeqlModels
           ref: ${{ github.event.inputs.qlModelShaOverride || github.ref }}
-      - name: Set up Python 3.8
+      - name: Set up Python 3.12
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: "3.12"
       - name: Download CodeQL CLI
         uses: ./script/.github/actions/fetch-codeql
       - name: Build modeled package list

.github/workflows/query-list.yml

@@ -26,10 +26,10 @@ jobs:
       uses: actions/checkout@v5
       with:
         path: codeql 
-    - name: Set up Python 3.8
+    - name: Set up Python 3.12
       uses: actions/setup-python@v4
       with:
-        python-version: 3.8
+        python-version: "3.12"
     - name: Download CodeQL CLI
       # Look under the `codeql` directory, as this is where we checked out the `github/codeql` repo
       uses: ./codeql/.github/actions/fetch-codeql