Request builder: Allow the use of insecure TLS ciphers when `Allow self-signed or invaid certificates` is used

[ztec]

Some server on the wild are badly configured. Either by mistake or lack of maintenance. Safe and unsafe Ciphers change overtime based on new discoveries.

This proposition will include considered unsafe ciphers when Allow self-signed or invalid certificates is used. It could be put into a separate option but, I felt this could fit in.

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• [x] I have tested my changes
• [x] There is no breaking changes
• [x] I really tested my changes and there is no regression
• [x] Ideally, my commit messages use the same convention as the Go project: https://go.dev/doc/contribute#commit_messages
• [x] I read this document: https://miniflux.app/faq.html#pull-request