Rename String.build block parameter #9386

Job	Run time
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	30m 25s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	30m 24s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	30m 26s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	30m 25s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	30m 26s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	30m 26s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	30m 25s
x86_64-gnu-test (1.7.3)	30m 25s
x86_64-gnu-test (1.8.2)	30m 25s
x86_64-gnu-test (1.9.2)	30m 25s
check_format	2m 5s
x86_64-gnu-test-preview_mt	6m 48s
deploy_api_docs	0s
x86_64-musl-test	30m 24s
	5h 43m 29s

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