contrib: dav1d: update to 1.4.1
1.4.1 is a small release of dav1d, improving notably ARM and RISC-V speed
- Optimizations for 6tap filters for NEON (ARM)
- More RISC-V optimizations for itx (4x8, 8x4, 4x16, 16x4, 8x16, 16x8)
- Reduction of binary size on ARM64, ARM32 and RISC-V
- Fix out-of-bounds read in 8bpc SSE2/SSSE3 wiener_filter
- Msac optimizations