gopls/integration/govim: update to latest govim
gopls/integration/govim: update to latest govim

Govim integration tests are now passing at govim HEAD + gopls HEAD, so
we should be able to start actively investigating any regressions on the
gopls side after this change.

Change-Id: Ibf50d7e42e19cfc80779691e2c42f643028b2e39
Reviewed-on: https://go-review.googlesource.com/c/tools/+/215897
Reviewed-by: Rebecca Stambler <d7cf11e5f299d88ea8348366a9fc4f7c335c3afa@golang.org>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools