Point to a forked version of pion/dtls with fingerprinting fix

Closed Cecylia Bocovich requested to merge cohosh/tor-browser-build:snowflake_ru_fix into master

This dtls fix removes the supported_groups extension from ServerHello messages of the DTLS handshake. We should make sure we updates this later after upstreaming the patch.

Thanks to @dcf and @ValdikSS for their work on this.

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