Set the resolver version to 2, clarify the error message when the ICU… #494

Job	Run time
test-bindgen	2m 59s
test-nondefault-features (63, renaming,icu_version_in_env,icu_version_69_max)	2m 42s
test-default-features (63)	3m 13s
test-static-linking (ubuntu-latest)	1m 19s
test-static-linking (macos-latest)	1m 21s
test-default-features (71)	3m 16s
test-with-features (71, renaming,icu_version_in_env,icu_version_64_plus,icu_version_67_plus,icu_v...	2m 33s
test-default-features (72)	3m 41s
test-with-features (71, renaming,icu_version_64_plus,icu_version_67_plus,icu_version_68_plus,icu_...	3m 2s
test-default-features (73)	3m 49s
test-with-features (72, renaming,icu_version_in_env,icu_version_64_plus,icu_version_67_plus,icu_v...	2m 33s
test-with-features (72, renaming,icu_version_64_plus,icu_version_67_plus,icu_version_68_plus,icu_...	3m 4s
test-with-features (73, renaming,icu_version_in_env,icu_version_64_plus,icu_version_67_plus,icu_v...	2m 50s
test-with-features (73, renaming,icu_version_64_plus,icu_version_67_plus,icu_version_68_plus,icu_...	2m 41s
	39m 3s

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