Upgrade to Go v1.12.13
Upgrading the Go compile version upgrade fixes:
- TCP keepalive problem in gitlab#34951 (closed). Golang v1.12 enables 15-second TCP keepalives by default.
- A test case: #3981 (closed)
Release notes: https://golang.org/doc/go1.12
Closes #3981 (closed)
Edited by Stan Hu