Bump GitHub Actions across workflows

Update workflow dependencies to newer major versions in repository automation files. This upgrades `actions/checkout` to v7, `actions/github-script` to v9, `actions/create-github-app-token` to v3, and GitHub Pages actions (`upload-pages-artifact` and `deploy-pages`) to v5 to keep CI/CD and maintenance workflows current.

.github/workflows/changelog-pr.yml

@@ -19,20 +19,20 @@ jobs:
     steps:
       - name: Generate a token
         id: generate-token
-        uses: actions/create-github-app-token@v1
+        uses: actions/create-github-app-token@v3
         with:
           app-id: ${{ vars.APP_ID }}
           private-key: ${{ secrets.APP_PRIVATE_KEY }}
 
       - name: Generate a token for PR approval and merge
         id: generate-token-merge
-        uses: actions/create-github-app-token@v1
+        uses: actions/create-github-app-token@v3
         with:
           app-id: ${{ secrets.APP_ID_APPROVE_AND_MERGE }}
           private-key: ${{ secrets.APP_KEY_APPROVE_AND_MERGE }}
 
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
 
@@ -53,7 +53,7 @@ jobs:
 
       - name: Get categorized pull requests
         id: get-categorized-prs
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           script: |
             async function main() {
@@ -213,7 +213,7 @@ jobs:
             return await main();
 
       - name: Update CHANGELOG.md
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           script: |
             const fs = require('fs').promises;