Update docker.io/library/golang Docker tag to v1.24 (#694)

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Update module golang.org/x/net to v0.30.0

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Fix incorrect client retransmissions

introduced by ec76652. If Client has gone to finished we know that
server sent Finished. No reason to ever re-send messages.

Resolves pion/webrtc#2909

Fix race between Conn.Close and Conn.Handshake

Fix multiple calls to Handshake

Handshake are synchronized by a mutex, but there is a panicing
scenario when the first handshake fails.

Prepare /v3

Update go.mod and imports for /v3

Mark NULL and AES256CM SRTP ciphers as supported

DTLS server checks this list during handshake. Without this change new
NULL and AES256CM SRTP ciphers were ignored.

A patch release with two fixes:

- #627
- #628

Update dependencies

github.com/pion/transport/v2 v2.2.1 => github.com/pion/transport/v2 v2.2.4
golang.org/x/crypto v0.8.0 => golang.org/x/crypto v0.18.0
golang.org/x/net v0.9.0 => golang.org/x/net v0.20.0

Drop invalid record silently during handshake

Fix issue: invalid record in handshake staging cause readloop
exited then handshake failed.