Update module github.com/pion/rtp to v1.8.8

Author: renovate[bot]

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/go-jet/jet/v2 v2.10.1
 	github.com/go-masonry/mortar v1.0.32
 	github.com/lib/pq v1.10.9
-	github.com/pion/rtp v1.8.0
+	github.com/pion/rtp v1.8.8
 	github.com/pion/rtp/v2 v2.0.0
 	github.com/pion/webrtc/v3 v3.2.14
 	go.uber.org/config v1.4.0