Prepare for separate branch_9x runs

.github/workflows/renovate-9x.yml

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+name: Renovate-9x
+on:
+  #schedule:
+    # Run every 4th hour
+  #  - cron: '0 */4 * * *'
+  # Or run on demand
+  workflow_dispatch:
+
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4.2.1
+      - name: Self-hosted Renovate
+        uses: renovatebot/github-action@v40.3.4
+        with:
+          configurationFile: solr/renovate-config-9x.js
+          renovate-version: 38.124.1-full
+          token: ${{ secrets.RENOVATE_TOKEN }}
+        env:
+          RENOVATE_FORK_TOKEN: ${{ secrets.RENOVATE_FORK_TOKEN }}
+          LOG_LEVEL: "info"
+          RENOVATE_DOCKER_USER: "1000:0"
+          RENOVATE_BINARY_SOURCE: "global"
+          RENOVATE_PR_FOOTER: "This PR has been generated by [Renovate Bot](https://github.com/solrbot/renovate-github-action)"

solr/renovate-config-9x.js

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+module.exports = {
+  gitAuthor: 'SolrBot <solrbot@cominvent.com>',
+  onboarding: false,
+  requireConfig: "required",
+  platform: 'github',
+  forkProcessing: "disabled",
+  repositories: ['apache/solr'],
+  baseBranches: ["branch_9x"],
+  allowedPostUpgradeCommands: ["./gradlew.*"],
+  branchPrefix: "renovate-9x/",
+  dryRun: "extract",
+};