esm: fix path normalization in `finalizeResolution` #4302

Job	Run time
Build slim tarball	2m 3s
x86_64-linux: with shared libraries	21m 23s
aarch64-linux: with shared libraries	17m 57s
aarch64-darwin: with shared libraries	19m 3s
x86_64-darwin: with shared libraries	38m 11s
	1h 38m 37s

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