[Absolutely not urgent] Bump Go 1.20.

[orhtej2]

Problem

As of v0.11.1 dendrite can be compiled with Go 1.20 and I see no reason why it shouldn't.

This probably gives no advantages and can safely be incorporated in some upcoming MR.

Solution

• Bumped referenced Go version to 1.20.

PR Status

• [ ] Code finished and ready to be reviewed/tested
• [ ] The fix/enhancement were manually tested (if applicable)

Automatic tests

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[tituspijean]

!testme

[yunohost-bot]

May the CI gods be with you!