Bump yosys from `cbd3ff2` to `4a475fa` #4730

Job	Run time
Detect code changes	10s
Build (Ubuntu 22.04)	1h 4m 18s
Build Compatibility: GCC-7 (Ubuntu 20.04)	54m 46s
Build Compatibility: GCC-8 (Ubuntu 20.04)	59m 11s
Build Compatibility: GCC-9 (Ubuntu 20.04)	56m 20s
Build Compatibility: GCC-10 (Ubuntu 20.04)	43m 14s
Build Compatibility: GCC-11 (Ubuntu 20.04)	58m 49s
Build Compatibility: Clang-6 (Ubuntu 20.04)	52m 21s
Build Compatibility: Clang-7 (Ubuntu 20.04)	1h 5m 33s
Build Compatibility: Clang-8 (Ubuntu 20.04)	48m 13s
Build Compatibility: Clang-10 (Ubuntu 20.04)	1h 8m 36s
Debug Build (Ubuntu 22.04)	46m 21s
Build w/o Yosys (Ubuntu 20.04)	47m 48s
Build w/o Yosys plugin (Ubuntu 20.04)	54m 48s
Build w/o test (Ubuntu 20.04)	54m 24s
Build w/o version number (Ubuntu 20.04)	50m 44s
Build w/o SWIG support (Ubuntu 20.04)	1h 12m 40s
No-warning Build (Ubuntu 22.04)	54m 2s
docker_regression_tests	0s
Build docker image for distribution	1m 32s
linux_regression_tests (basic_reg_yosys_only_test)	51s
linux_regression_tests (basic_reg_test)	15m 8s
linux_regression_tests (fpga_verilog_reg_test)	13m 4s
linux_regression_tests (fpga_bitstream_reg_test)	20m 50s
linux_regression_tests (fpga_sdc_reg_test)	1m 17s
linux_regression_tests (fpga_spice_reg_test)	1m 13s
linux_regression_tests (micro_benchmark_reg_test)	8m 33s
linux_regression_tests (quicklogic_reg_test)	23m 9s
linux_regression_tests (vtr_benchmark_reg_test)	24m 49s
linux_regression_tests (iwls_benchmark_reg_test)	19m 27s
linux_regression_tests (tcl_reg_test)	2m 48s
	18h 4m 59s

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