Feature/renovate bot (jahwag#90)

### PR: Add Renovate Configuration for Automated Dependency Management

#### Summary
This pull request introduces a Renovate configuration to automate
dependency updates for this repository. With Renovate, we aim to keep
our dependencies up-to-date, improve security by addressing potential
vulnerabilities quickly, and maintain compatibility with the latest
versions of libraries.

#### Details

- **Renovate Configuration**:
- Enables updates for `pip` requirements files (e.g.,
`requirements.txt`).
  - Groups non-major updates to reduce PR noise.
- Schedules updates outside of regular working hours to minimize
disruptions.
- Optionally includes GitHub Actions updates to keep workflows current.

- **Key Features**:
- **Automated Dependency Updates**: Renovate will check for updates
regularly and create pull requests for any available updates.
- **Security**: Reduces the risk of vulnerabilities in outdated
dependencies.
- **Compatibility and Stability**: Maintains compatibility with updated
libraries and improves code stability over time.

#### How It Works
1. Renovate will open pull requests for dependency updates according to
the rules defined in the `renovate.json` file.
2. Each PR will be labeled and grouped as per the configuration,
allowing us to review, test, and merge updates efficiently.

#### Next Steps
Once merged, Renovate will begin creating PRs for available dependency
updates according to the configured schedule and rules. We can monitor
and review these updates through the GitHub dashboard and merge them as
appropriate.

--- 

Please review and let me know if any adjustments are needed to the
configuration before we merge this.

Closes jahwag#89

.github/workflows/renovate.yml

@@ -0,0 +1,19 @@
+name: Renovate
+
+on:
+  schedule:
+    - cron: '0 3 * * *'  # Runs daily at 3 AM UTC
+  workflow_dispatch:
+
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Run Renovate
+        uses: renovatebot/github-action@v36
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

renovate.json

@@ -0,0 +1,24 @@
+{
+  "extends": ["config:base"],
+  "pip_requirements": {
+    "enabled": true
+  },
+  "packageRules": [
+    {
+      "matchManagers": ["pip_requirements"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "groupName": "All non-major Python updates"
+    },
+    {
+      "matchManagers": ["github-actions"],
+      "groupName": "GitHub Actions updates"
+    }
+  ],
+  "automerge": false,
+  "timezone": "UTC",
+  "schedule": ["after 10pm and before 5am"],
+  "labels": ["dependencies", "renovate"],
+  "dependencyDashboard": true,
+  "prHourlyLimit": 5,
+  "prConcurrentLimit": 10
+}