It was manually created, then deleted, then re-created and now does not
work properly as the proxy.golang.org has incorrect artifacts in, and
sum.golang.org has the incorrect checksum, and both of these are
designed to be immutable (as a security measure).

Fixing this requires retracting 1.27.0 and releasing a new version (e.g:
1.27.1).

Related: https://github.com/golang/go/issues/45517

The original issue was found & reported by @Cristim

Fixes #2775

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[Apache 2.0 license]: https://www.apache.org/licenses/LICENSE-2.0