chore: upgrade electron

[Tuditi]

Summary

Upgraded electron to 13.6.9

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Changelog

- Upgraded electron to 13.6.9
- Removed unused css selectors
- Removed code duplication FontweightNumber (unused) & FontweightText (-> Fontweight)
- Fixed some warnings

Relevant Issues

#3743

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Testing

Platforms

Please select any platforms where your changes have been tested.

• Desktop
  • [ ] MacOS
  • [x] Linux
  • [ ] Windows
• Mobile
  • [ ] iOS
  • [ ] Android

Instructions

Please describe the specific instructions, configurations, and/or test cases necessary to test and verify that your changes work as intended.

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Checklist

Please tick all of the following boxes that are relevant to your changes.

• [x] I have followed the contribution guidelines for this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added or modified tests that prove my changes work as intended
• [x] I have verified that new and existing unit tests pass locally with my changes
• [ ] I have verified that my latest changes pass CI workflows for testing and linting
• [ ] I have made corresponding changes to the documentation