Pin runners to ubuntu-26.04 and bump setup-python to v6

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Author: denis-yuen

.github/workflows/codeql.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   analyze:
     name: Analyze
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     permissions:
       actions: read
       contents: read

.github/workflows/maven.yml

@@ -6,7 +6,7 @@ name: Node.js CI with SAM
 on: [push, pull_request]
 jobs:
   linterWithESLint:
-     runs-on: ubuntu-latest
+     runs-on: ubuntu-26.04
      steps:
      - uses: actions/checkout@v6
      - name: Use Node.js
@@ -16,11 +16,11 @@ jobs:
      - run: npm ci --ignore-scripts
      - run: npm run lint
   testWithSAMCLI:
-     runs-on: ubuntu-latest
+     runs-on: ubuntu-26.04
      steps:
      - uses: actions/checkout@v6
      - name: Set up Python
-       uses: actions/setup-python@v5
+       uses: actions/setup-python@v6
        with:
          python-version: "3.12"
      - name: Install dependencies