hack: quote REPO_ROOT_DIR inside mktemp call in verify-codegen.sh

[Ankitsinghsisodya]

Fixes #9003

Summary

• Add quotes around ${REPO_ROOT_DIR} in the mktemp call in hack/verify-codegen.sh to handle repo paths containing spaces.

[knative-prow]

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[knative-prow]

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[Copilot]

Pull request overview

This PR fixes a path-handling bug in hack/verify-codegen.sh by quoting ${REPO_ROOT_DIR} in the mktemp template so the script works correctly when the repository root directory contains spaces.

Changes:

• Quote ${REPO_ROOT_DIR} in the mktemp -d call used to create TMP_DIFFROOT.

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