Wheel size, PCD, offset, and other specifications such as bolt pattern, thread size (THD), center bore (CB), trim levels for 2024 Mazda CX-30. Wheel and tire fitment data. Original equipment and alternative options.
www.wheel-size.com
As you can see. the offset range for your car is 43-47, with a 7" wheel.
an 8" wheel with the same offset means your offset will be more than 10mm off. That's not recommended.
Unless you are planning to gain a cool 50hp, the extra width in wheel and tire is completely unnecessary. If you still want to do it, I would suggest selecting a wheel with a compensatory offset figure that brings thing in line with stock. 7" ET45 ---> 8" would be approx ET32, give or take 2, but you'd need to verify that it would clear your suspension components.