Update nvidia-beta-driver to 450.57
Changes:
- Fixed a bug that caused a brief orange flash on some platforms when a display mode is being set.
- Fixed a bug that could cause the X server to crash when using large cursor images with PRIME display offloading.
- Fixed an interaction problem with 5.4 and newer Linux kernels that caused a performance regression when allocating system memory.
- Fixed driver installation failures on Linux kernel 5.8 release candidates