golang: bump to 1.20.6

[changkun]

Why is it worth to add this package?

Hi community, I am one of the @golang/android maintainers, and termux is used to help set up the Go community android CI builders—many thanks for this great project. See android-arm-corellium and android-arm64-corellium at https://farmer.golang.org/builders.

However, recently Go community decided to require Go 1.20.6 as the bootstrap version. See also golang/go#54265.

This decision makes our maintained Android builders fail to continuously run code patches to guarantee Android support, for example: https://build.golang.org/log/dc00916946b2c6482a5d7bd1340a40a4a527bdca

Is it possible to bump the pkg install golang version to 1.20.6 or above so that we can set up the Android builders to continuously support running Go on Android?

cc @xtkoba

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https://github.com/golang/go

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