gitian: update reproducible builds to build with Go 1.12.8 (#3902)

scripts/gitian-build.sh

@@ -8,7 +8,7 @@
 set -euo pipefail
 
 GITIAN_CACHE_DIRNAME='.gitian-builder-cache'
-GO_DEBIAN_RELEASE='1.12.5-1'
+GO_DEBIAN_RELEASE='1.12.8-1'
 GO_TARBALL="golang-debian-${GO_DEBIAN_RELEASE}.tar.gz"
 GO_TARBALL_URL="https://salsa.debian.org/go-team/compiler/golang/-/archive/debian/${GO_DEBIAN_RELEASE}/${GO_TARBALL}"
 

scripts/gitian-descriptors/gitian-darwin.yml

@@ -23,11 +23,11 @@ remotes:
 - "url": "https://github.com/tendermint/tendermint.git"
   "dir": "tendermint"
 files:
-- "golang-debian-1.12.5-1.tar.gz"
+- "golang-debian-1.12.8-1.tar.gz"
 script: |
   set -e -o pipefail
 
-  GO_SRC_RELEASE=golang-debian-1.12.5-1
+  GO_SRC_RELEASE=golang-debian-1.12.8-1
   GO_SRC_TARBALL="${GO_SRC_RELEASE}.tar.gz"
   # Compile go and configure the environment
   export TAR_OPTIONS="--mtime="$REFERENCE_DATE\\\ $REFERENCE_TIME""

scripts/gitian-descriptors/gitian-linux.yml

@@ -23,11 +23,11 @@ remotes:
 - "url": "https://github.com/tendermint/tendermint.git"
   "dir": "tendermint"
 files:
-- "golang-debian-1.12.5-1.tar.gz"
+- "golang-debian-1.12.8-1.tar.gz"
 script: |
   set -e -o pipefail
 
-  GO_SRC_RELEASE=golang-debian-1.12.5-1
+  GO_SRC_RELEASE=golang-debian-1.12.8-1
   GO_SRC_TARBALL="${GO_SRC_RELEASE}.tar.gz"
   # Compile go and configure the environment
   export TAR_OPTIONS="--mtime="$REFERENCE_DATE\\\ $REFERENCE_TIME""

scripts/gitian-descriptors/gitian-windows.yml

@@ -23,11 +23,11 @@ remotes:
 - "url": "https://github.com/tendermint/tendermint.git"
   "dir": "tendermint"
 files:
-- "golang-debian-1.12.5-1.tar.gz"
+- "golang-debian-1.12.8-1.tar.gz"
 script: |
   set -e -o pipefail
 
-  GO_SRC_RELEASE=golang-debian-1.12.5-1
+  GO_SRC_RELEASE=golang-debian-1.12.8-1
   GO_SRC_TARBALL="${GO_SRC_RELEASE}.tar.gz"
   # Compile go and configure the environment
   export TAR_OPTIONS="--mtime="$REFERENCE_DATE\\\ $REFERENCE_TIME""