Update Go version requirement for building 21.1 from source #10489
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Technically, the minimum required is 1.15.3:
https://github.com/cockroachdb/cockroach/blob/release-21.1/build/go-version-check.sh#L10
However, 1.15.11 avoids these Go bugs:
golang/go#45076
golang/go#45187
golang/go#42884
So to prevent users from running into those, we listing
1.15.11 as the minimum required version, followed by
a note that you can use IGNORE_GOVERS=1 to try building
with older versions.
Fixes #10468
Fixes #9081