PoE cameras usually signal at 100MBit rate at most so they will be fine if connected to either Gbit or 100Mbit switch. But in the end, data from those cameras need to go to the system and if uplink is also 100Mbit and you have many cameras, it will be a limiting factor. Also, there are barely any PoE 100Mbit switches being made for last 10 years, unless you buy used.
TLDR: buy Gbit PoE switch.
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