go-toolset:rhel8 security, bug fix, and enhancement update

Go Toolset provides the Go programming language tools and libraries. Go is alternatively known as golang.

The following packages have been upgraded to a later upstream version: golang (1.15.7), delve (1.5.0).

Security Fix(es):

* golang: crypto/elliptic: incorrect operations on the P-224 curve (CVE-2021-3114)
* golang: cmd/go: packages using cgo can cause arbitrary code execution at build time (CVE-2021-3115)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

CVE-2021-3114
In Go before 1.14.14 and 1.15.x before 1.15.7, crypto/elliptic/p224.go can generate incorrect outputs, related to an underflow of the lowest limb during the final complete reduction in the P-224 field.
CVE-2021-3115
Go before 1.14.14 and 1.15.x before 1.15.7 on Windows is vulnerable to Command Injection and remote code execution when using the "go get" command to fetch modules that make use of cgo (for example, cgo can execute a gcc program from an untrusted download).

Modularity name: go-toolset
Stream name: rhel8