Update module github.com/pion/rtp to v1.8.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/pion/rtp	v1.8.3 -> v1.8.4

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Release Notes

pion/rtp (github.com/pion/rtp)

v1.8.4

Compare Source

Changelog

• 057eda3 Add static RTP PayloadTypes as a constant
• c52c1e7 Fix broken link in README.md
• 410c582 Fix a bug in AbsCpatureTimeExtension
• 78da5a2 Add VLA extention header parser
• 314bd8e Update CI configs to v0.11.3
• 83ef144 Update CI configs to v0.11.0
• 5fb9380 Remove 'Generate Authors' workflow

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