esm: fix path normalization in `finalizeResolution` #3853

Job	Run time
Build slim tarball	2m 58s
x86_64-darwin: with shared libraries	27m 57s
x86_64-linux: with shared libraries	22m 43s
aarch64-linux: with shared libraries	18m 7s
aarch64-darwin: with shared libraries	21m 34s
	1h 33m 19s

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