Security update for go1.14

Open Source Vulnerabilities SUSE-SU-2020:3369-1

This update for go1.14 fixes the following issues: - go1.14.12 (released 2020-11-12) includes security fixes to the cmd/go and math/big packages. * go#42553 math/big: panic during recursive division of very large numbers (bsc#1178750 CVE-2020-28362) * go#42560 cmd/go: arbitrary code can be injected into cgo generated files (bsc#1178752 CVE-2020-28367) * go#42557 cmd/go: improper validation of cgo flags can lead to remote code execution at build time (bsc#1178753 CVE-2020-28366) * go#42155 time: Location interprets wrong timezone (DST) with slim zoneinfo * go#42112 x/net/http2: the first write error on a connection will cause all subsequent write requests to fail blindly * go#41991 runtime: macOS-only segfault on 1.14+ with 'split stack overflow' * go#41913 net/http: request.Clone doesn't deep copy TransferEncoding * go#41703 runtime: macOS syscall.Exec can get SIGILL due to preemption signal * go#41386 x/net/http2: connection-level flow control not returned if stream errors, causes server hang