Test

clean: limits the parallelism of builds #606

Job	Run time
test-bindgen	1m 43s
test-nondefault-features (63, renaming,icu_version_in_env,icu_version_69_max)	1m 20s
test-default-features (63)	2m 2s
test-main-branch (74)	7m 22s
test-default-features (72)	2m 0s
test-default-features (73)	2m 2s
test-static-linking (ubuntu-latest)	50s
test-default-features (74)	1m 58s
test-with-features (72, renaming,icu_version_in_env,icu_version_64_plus,icu_version_67_plus,icu_v...	1m 21s
test-with-features (72, renaming,icu_version_64_plus,icu_version_67_plus,icu_version_68_plus,icu_...	1m 54s
test-with-features (73, renaming,icu_version_in_env,icu_version_64_plus,icu_version_67_plus,icu_v...	1m 24s
test-with-features (73, renaming,icu_version_64_plus,icu_version_67_plus,icu_version_68_plus,icu_...	1m 56s
test-with-features (74, renaming,icu_version_in_env,icu_version_64_plus,icu_version_67_plus,icu_v...	1m 21s
test-with-features (74, renaming,icu_version_64_plus,icu_version_67_plus,icu_version_68_plus,icu_...	1m 57s
	29m 10s

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