Mark return value of .asTypeOf as "deprecated read-only" (#4198) #7

Job	Run time
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Benchmarking Sanity Check	2m 35s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / ci	15m 22s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Integration Tests	10m 4s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Formatting	1m 32s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / compile project with mill	3m 34s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Standard Library Tests (2.13.14)	2m 20s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Build Mdoc & Website	7m 14s
ci (ubuntu-22.04, 8, 2.13.14, 2.4) / Test Scala-CLI Example / Build and Test	3m 3s
check tests	1s
all tests passed	1s
Deploy Website	12s
publish	1m 11s
	47m 9s

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