Release v2.9.0.0

Known issues

• Bootloader interaction (flashing and bootloader upgrading) is known to not work. A followup bugfix release will address this issue
• Added a check to prevent flashing applications on Network type bootloaders (PoE). A follow up bootloader release will address this issue

Features

• Script Node (On device scripting using Python 3.9)
• SPIIn Node (Receive messages through SPI Interface)
• Asset management improvement
• Improved syntax for creating nodes: eg: pipeline.create(dai.node.XLinkOut)
• Better Python type resolving

Bugs

• XLink segfault fix
• Performance regression fix when using USB due to changed L2 cache behaviour from copy back to write through.
• Added missing IMU calibration field when reading EEPROM data

Misc

• Updated pybind11 to 2.7.0
• Dependencies without git clone for piwheels compatibility
• Code changes: #337