Upgrade dependency 'gorilla/websocket' to avoid checksum mismatch.

[HappyHacker123]

Problem description

Currently ziti@v1.1.5 depends on gorilla/websocket@v1.5.2. But as shown in #websocket-927, websocket may have retagged version v1.5.2, so the checksum from the code in github does not match the checksum saved in sum.golang.org.
Consequently, when trying to download websocket directly, the following error will occur.

root@iZj6c5flh0q5ax3d1ttfuhZ:~/temp# GOPROXY=direct go get github.com/gorilla/websocket@v1.5.2
go: downloading github.com/gorilla/websocket v1.5.2
verifying github.com/gorilla/websocket@v1.5.2: checksum mismatch
        downloaded: h1:IhsoD2hZmkRRR2jvKyztbbsF4KtoCfNkrlaPsqN31MQ=
        go.sum:     h1:qoW6V1GT3aZxybsbC6oLnailWnB+qTMVwMreOso9XUw=

SECURITY ERROR
This download does NOT match an earlier download recorded in go.sum.
The bits may have been replaced on the origin server, or an attacker may
have intercepted the download attempt.

For more information, see 'go help module-auth'.

Possible solution

Upgrade websocket to v1.5.3