chore: update renovate configuration

[guillaumejparis]

Proposed changes

Testing Instructions

1. Step-by-step how to test
2. Environment or config notes

Related issues

• Closes #ISSUE-NUMBER

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality
• For bug fix -> I implemented a test that covers the bug

Further comments

[Copilot]

Pull request overview

Updates the Renovate bot configuration to use semantic commits, raise concurrency limits, disable vulnerability alerts, and enable weekly lock-file maintenance, while removing the custom commit message prefix.

Changes:

• Adds :semanticCommits preset and removes the custom commitMessageAction/commitMessagePrefix.
• Raises prConcurrentLimit from 20 to 100 and adds branchConcurrentLimit: 100.
• Disables vulnerabilityAlerts and enables lockFileMaintenance on a weekly schedule.

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