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This changes which Go version we use for official releases and for everyday development and testing.
At the time of this commit Go 1.20.1 is available but is not yet included in goenv, the tool that we use in some environments for reacting automatically to this file. I expect we'll upgrade to Go 1.20.1 very soon, but this is a routine upgrade to the latest major release so that we can start soaking in the new compiler and library behaviors throughout the v1.5 development period.
Go 1.20 continues to support only Unicode 13, so we do not need to make any changes to our supporting packages that also rely on Unicode data.
This closes #32420. That issue includes some draft changelog entries to consider once this is merged.