community/go: security upgrade to 1.15.7

Announcement: https://groups.google.com/g/golang-announce/c/mperVMGa98w
7 jobs for !17048 with 3.13-go-1.15.7 in 40 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
failed #297819
docker-alpine x86_64 allowed to fail
lint

00:00:09

 
  Build
failed #297824
docker-alpine ci-build aarch64
build-aarch64

00:00:07

failed #297825
docker-alpine ci-build armv7
build-armv7

00:00:12

failed #297823
docker-alpine ci-build ppc64le
build-ppc64le

00:00:07

failed #297822
docker-alpine ci-build s390x
build-s390x

00:00:10

failed #297821
docker-alpine ci-build x86
build-x86

00:00:05

failed #297820
docker-alpine ci-build x86_64
build-x86_64

00:00:06

 
Name Stage Failure
failed
build-x86 Build
No job log
failed
build-x86_64 Build
No job log
failed
build-s390x Build
No job log
failed
lint Lint
No job log
failed
build-armv7 Build
No job log
failed
build-aarch64 Build
No job log
failed
build-ppc64le Build
No job log