Update Aug 5, 2021 tracked by Updatify

go1.15.15 (released 2021-08-05)

go1.15.15 (released 2021-08-05) includes a security fix to the net/http/httputil package, as well as bug fixes to the compiler, runtime, the go command, and the net/http package. See the Go 1.15.15 milestone on our issue tracker for details.