Replace deprecated io/ioutil with modern os/io equivalents#373
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Replaces all ioutil.ReadFile, WriteFile, ReadDir, TempDir, TempFile, ReadAll and Discard calls with their Go 1.16+ replacements in os and io packages. Also removes deprecated rand.Seed(time.Now().UnixNano()) from randomString() (deprecated since Go 1.20) and removes the now-unused time import.
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Summary
ioutil.ReadFile,WriteFile,ReadDir,TempDir,TempFile,ReadAll, andDiscardcalls with their Go 1.16+ equivalents in theosandiopackagesrand.Seed(time.Now().UnixNano())fromrandomString()(deprecated since Go 1.20;math/randis kept sincerand.Intnis still used)"time"import fromsupply.goMotivation
io/ioutilwas deprecated in Go 1.16 andrand.Seedwas deprecated in Go 1.20. All buildpacks now target Go 1.24.x.Related
Part of a series of identical PRs across all CF buildpacks and libbuildpack (see cloudfoundry/libbuildpack#211).