Exclude sorbet assignments from Style/MutableConstant cop #29583

Job	Run time
syntax	1m 20s
tap syntax	8m 16s
vendored gems	48s
docker	4m 44s
cask audit	3m 38s
formula audit	6m 42s
test default formula (Ubuntu 22.04)	4m 55s
test default formula (Ubuntu 20.04)	6m 30s
tests (online)	9m 17s
test default formula (macOS 13 x86_64)	3m 0s
update-test (Ubuntu 22.04)	23s
tests (generic OS)	6m 1s
test default formula (macOS 14 arm64)	1m 24s
tests (Ubuntu 22.04)	6m 16s
update-test (macOS 13)	24s
tests (Ubuntu 20.04)	7m 54s
tests (macOS 13 x86_64)	6m 57s
tests (macOS 14 arm64)	5m 49s
	1h 24m 18s

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