Update module github.com/pion/webrtc/v3 to v3.1.12

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/pion/webrtc/v3	require	patch	v3.1.11 -> v3.1.12

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Release Notes

pion/webrtc

### [`v3.1.12`](https://togithub.com/pion/webrtc/compare/v3.1.11...v3.1.12) [Compare Source](https://togithub.com/pion/webrtc/compare/v3.1.11...v3.1.12)

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