util: Use let instead of var for util/inspect.js
Style changes: use let instead of var in lib/internal/util/inspect.js
Checklist
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make -j4 test(UNIX), orvcbuild test(Windows) passes -
commit message follows commit guidelines
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Style changes: use let instead of var in lib/internal/util/inspect.js
make -j4 test (UNIX), or vcbuild test (Windows) passes