Update to latest Ruby (v3) and Rails (v7)

[julianguyen]

Description

• Update to latest Ruby (v3) and Rails (v7)
• Refer to the official guide

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[toshitapandey]

@julianguyen - I have assigned this issue to myself. Is it okay if I work on it?

[julianguyen]

Yess that would be great, thank you, @toshitapandey! Hope you're doing well 💜

[uzorjchibuzor]

@toshitapandey are you still working on this? I can pick it up instead if not.

[uzorjchibuzor]

@julianguyen I have started work on this pending when I get a reply from @toshitapandey , after the first step to upgrading, I have a question. Is there a reason cloudinary fails locally? If it's API related maybe it should be skipped. pending when another PR can fix it.

[julianguyen]

Hey @uzorjchibuzor I can just assign you to this since it's been a couple of weeks since it was originally assigned.

Cloudinary fails locally if you don't set up the API keys for it, and that's okay. But you should generate one to test the full experience.

[uzorjchibuzor]

I will do that.