Small change to update-go-version.md - remove step to update version tag
Updating version tag in hack/builder/version.sh is no longer
necessary thanks to Roman's PR which can be found here:
@@ -8,8 +8,7 @@ In addition, [go rules for bazel](https://github.com/bazelbuild/rules_go) have t
## Updating Go Version
### Updating builder image
-* Update `VERSION` tag in [hack/builder/version.sh](../hack/builder/version.sh).
- * For example, change from `VERSION=30-9.0.3` to `VERSION=30-9.0.4`
+
* Change the `GIMME_GO` version in the [hack/builder/Dockerfile](../hack/builder/Dockerfile) to the desired Go version.
* Rebuild the builder image by executing `make builder-build`.
