Update: Replace deprecated sets.String with sets.Set from pkg/activator/net

[akagami-harsh]

Fixes #

• part of Fix all lint warnings #14692
• completes one task
  • SA1019: sets.String is deprecated

Proposed Changes

• replace deprecated sets.String with sets.Set

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[ReToCode]

As this is depending on changes in networking and also in pkg there are more places to change this. As we need it for the close release, I did it here: #14765.