sync/atomic alignment fix

[abe-winter]

What changed

• This changes the position of streamIDCounter so it has a 64-bit offset

Why

• On 32-bit arm systems, sync/atomic will panic on this field

Lint failure

These only show up when you run the linter on 32-bit arm hardware, but the message looks like this:

rpc/wrtc_client_channel.go:241:7: SA1027: address of non 64-bit aligned field streamIDCounter passed to sync/atomic.AddUint64 (staticcheck)
                Id: atomic.AddUint64(&ch.streamIDCounter, 1),
                    ^

The rdk repo will soon check all of its dependencies for these lint failures.

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1 out of 2 committers have signed the CLA.

✅ abe-winter
❌ Abe Winter

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[maximpertsov]

TIL

[github-actions]

For security reasons, this PR must be labeled with safe to test in order for tests to run.