Pin github.com/pion/dtls/v2 version using the replace directive

[codecov-commenter]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (51f2671) 74.11% compared to head (d0eb19d) 73.08%.

:exclamation: Current head d0eb19d differs from pull request most recent head 1a328d7. Consider uploading reports for the commit 1a328d7 to get more accurate results

Files	Patch %	Lines
tcp/server/server.go	0.00%	0 Missing and 2 partials :warning:
dtls/client.go	0.00%	0 Missing and 1 partial :warning:
dtls/server/server.go	0.00%	0 Missing and 1 partial :warning:
net/connUDP.go	0.00%	1 Missing :warning:
tcp/client.go	0.00%	0 Missing and 1 partial :warning:
tcp/client/conn.go	66.66%	0 Missing and 1 partial :warning:
udp/client.go	0.00%	0 Missing and 1 partial :warning:
udp/client/conn.go	80.00%	0 Missing and 1 partial :warning:
udp/server/server.go	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #534 +/- ## ========================================== - Coverage 74.11% 73.08% -1.03% ========================================== Files 71 72 +1 Lines 5853 5945 +92 ========================================== + Hits 4338 4345 +7 - Misses 1122 1209 +87 + Partials 393 391 -2 ```

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[sonarcloud[bot]]

Quality Gate failed

Failed conditions
5.8% Duplication on New Code (required ≤ 5%)

See analysis details on SonarCloud