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Add assert_in_ractor #23

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-latest 2.3	25s
ubuntu-latest 2.5	22s
windows-latest 2.4	1m 13s
ubuntu-latest 2.4	23s
macos-latest 2.6	50s
windows-latest 2.7	1m 11s
windows-latest 2.3	1m 22s
ubuntu-latest 2.6	27s
windows-latest 3.0	59s
ubuntu-latest 2.7	27s
macos-latest 2.7	38s
ubuntu-latest 3.1	11s
macos-latest 3.0	10s
ubuntu-latest 3.0	8s
windows-latest 3.1	1m 6s
windows-latest 3.3	51s
macos-latest 3.1	11s
windows-latest 3.4	43s
windows-latest 2.5	1m 24s
windows-latest 2.6	1m 32s
ubuntu-latest head	8s
windows-latest 4.0	51s
ubuntu-latest 3.2	11s
macos-15-intel 2.3	1m 24s
macos-latest head	12s
macos-latest 3.2	13s
ubuntu-latest 3.3	10s
macos-latest 3.4	14s
windows-latest 3.2	55s
macos-15-intel 2.4	1m 7s
macos-latest 4.0	11s
macos-latest 3.3	20s
windows-latest mingw	41s
macos-15-intel 2.5	1m 1s
ubuntu-latest 3.4	11s
windows-latest mswin	1m 12s
ubuntu-latest 4.0	14s
	23m 51s