Update go version for ci from 1.12.x to 1.13.x

RHEL-8 which is used to build the release bits of crc have
1.13.4 version of golang and currently our CI is using the
older major version.

Author: praveenkumar

.circleci/config.yml

@@ -7,7 +7,7 @@ jobs:
     macos:
       xcode: "10.0.0"
     environment:
-      GOVERSION: "1.12.8"
+      GOVERSION: "1.13.4"
 
 ## Build crc
     steps:

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 
 go:
-- 1.12.8
+- 1.13.4
 
 script:
 - make

centos_ci.sh

@@ -3,7 +3,7 @@
 # bundle location
 BUNDLE_VERSION=4.4.3
 BUNDLE=crc_libvirt_$BUNDLE_VERSION.crcbundle
-GO_VERSION=1.12.13
+GO_VERSION=1.13.4
 
 # Output command before executing
 set -x