Revert "bootstrap/cibuild: Print the Go version for easier debugging"

This reverts commit fcb3ce9 in favor of the previous commit.

Author: sschuberth

script/bootstrap

@@ -1,8 +1,6 @@
 #!/usr/bin/env bash
 set -e
 
-go version
-
 if uname -s | grep -q "_NT-"; then
   # Tell Cygwin / MSYS to really create symbolic links.
   export CYGWIN="$CYGWIN winsymlinks:nativestrict"

script/cibuild

@@ -1,8 +1,5 @@
 #!/usr/bin/env bash
 set -e
-
-go version
-
 script/test
 
 # re-run test to ensure GIT_TRACE output doesn't leak into the git package