Fix profile-level-id check to support Edge

Code review changes

Cache byte slice only

Update Makefile

Remove `--dirty` from `examples/alohacam/Makefile` as well (Go modules modifies the file, always resulting in a "dirty" build).

Make unsupport STUN methods non-fatal

Unsupported STUN methods, such as the Send method (method 6)
introduced by TURN and sent by TURN relays, should not be
fatal.

In particular, TURN relays send a STUN binding indication via
the Send method to enable clients to authenticate the relay.
The indication does not require a reply, and does not even need
to be handled to be able to send video via the relay, but it
must not terminate the program.

Fix CI version filter from vx.y.z to x.y.z