chore(deps): update go to v1.20.8 (patch)

[cilium-renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/library/golang		patch	1.20.7-alpine -> 1.20.8-alpine
docker.io/library/golang	final	patch	1.20.7 -> 1.20.8
docker.io/library/golang	stage	patch	1.20.7 -> 1.20.8
go (source)		patch	1.20.7 -> 1.20.8

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