topic(build): adding .go-version to track latest go version supported #8181
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Problem
Dgraph is built in different go versions that are inconsistent, such as go1.14 or go.1.16. Some versions can cause non-deterministic results when troubleshooting issues, and this could violate any compliance industry should locking down versions of libraries becomes important.
Solution
This adds versioning mechanism to lock latest go version supported by Dgraph. Scripts can be made to use this as a source of truth to explicitly set the version of go.