Replace deprecated io/ioutil with modern os/io equivalents#241
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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. Removes the io/ioutil import from all affected files.
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Summary
ioutil.ReadFile,WriteFile,ReadDir,TempDir,TempFile,ReadAll, andDiscardcalls with their Go 1.16+ equivalents in theosandiopackagesio/ioutilimport from all affected filesMotivation
io/ioutilwas deprecated in Go 1.16. All buildpacks now target Go 1.24.x, so these modern replacements are fully supported.Related
Part of a series of identical PRs across all CF buildpacks and libbuildpack (see cloudfoundry/libbuildpack#211).