go_register_toolchains: set default version

[rgs1]

The support for a default version in go_register_toolchains is gone, so
we need to pass an explicit version.

Signed-off-by: Raul Gutierrez Segales rgs@pinterest.com

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[rgs1]

@googlebot I signed it!

[rgs1]

Not really needed, see workaround here:

bazelbuild/rules_go#2761