Use `require` rather than `replace` for dtls version.

Merged David Fifield requested to merge dcf/snowflake:dtls_v2.0.12 into main

This is an update to !66 (merged). I think that replace is needed only when rewriting the URL of a dependency. To update the version number only requires go get.

go mod edit -dropreplace=github.com/pion/dtls/v2
go get github.com/pion/dtls/v2@v2.0.12

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