Merge pull request #9659 from timchinowsky/add-pio-background-read

Merge pull request #9759 from dhalbert/rp2350-volatile-cache-invalidate

Fix PSRAM cache invalidation

Merge pull request #9744 from dcooperdalrymple/audiofilters

Add Audio effects: Filters

Merge pull request #9709 from dhalbert/pin-sphinx

pin sphinx temporarily while debugging doc build

Merge pull request #9636 from tannewt/rp2350_320x240_8bit

Add RP2350 support for 320x240 8bit color

Merge pull request #9616 from tannewt/fix_c6_crash

Three fixes found for ESP32-C6

Merge pull request #9579 from dhalbert/9.1.x-esp32-c6-uart-fix

ESP32-C6: don't use LP (low-power) UART

Merge pull request #9540 from elpekenin/fix/_bleio-stubs

Fix `_bleio` doc comments

Merge pull request #9545 from tannewt/fix_funhouse_wifi

Fix FreeRTOS weirdness on Funhouse

Merge pull request #9490 from tannewt/rp2350

Add support for the new RP2350