[Go] Make change to ensure flatbuffer reads are aligned

[asfimport]

See parent task for requirements.  @sbinet  do you think you will be work on this?

Reporter: Micah Kornfield / @emkornfield
Assignee: Sebastien Binet / @sbinet

PRs and other links:

• GitHub Pull Request #5251

_{Note: This issue was originally created as ARROW-6316. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 5251
#5251