response.text() memory consumption is too high

Getting the following exception:

`memory allocation failed, allocating 32763 bytes`

I have a bit more than 3X memory free at the time of making the call to response.text().

https://github.com/adafruit/Adafruit_CircuitPython_Requests/blob/c567e1d70e469c147e6cd38373aba2a8b797b7ba/adafruit_requests.py#L327

What I've found is that each pass through the `iter_content` loop is consuming 2X `chunk_size` (so 2X the content in total) and then at the `self.close()` another allocation happens for the full content size, where it throws the exception. Unclear to me if that's coming from `.close` or from the `.join` in `content`:

https://github.com/adafruit/Adafruit_CircuitPython_Requests/blob/c567e1d70e469c147e6cd38373aba2a8b797b7ba/adafruit_requests.py#L292

I've found that increasing the `chunk_size` to 64 gets me working at a cost of 2.5X `chunk_size` per pass through the `iter_content` loop (but half as many passes).

https://github.com/adafruit/Adafruit_CircuitPython_Requests/blob/c567e1d70e469c147e6cd38373aba2a8b797b7ba/adafruit_requests.py#L327

First observed on `Adafruit CircuitPython 8.2.10 on 2024-02-14; Raspberry Pi Pico W with rp2040`

Also reproduced on `Adafruit CircuitPython 9.0.2 on 2024-03-28; Raspberry Pi Pico W with rp2040`

Start in adafruit_requests.py around the content/close code at line 292 and the iter_content loop at line 327. Reproduce the response.text() allocation failure on the reported Raspberry Pi Pico W and CircuitPython versions, then trace the repeated allocations. Done means the reported response can be read without the memory allocation exception.

Written by the indexing model from the issue text.