Update go toolchain directive to v1.26.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
go (source)	toolchain	minor	1.25.6 → 1.26.3
go	uses-with	minor	1.25.x → 1.26.x

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Release Notes

golang/go (go)

v1.26.3

v1.26.2

v1.26.1

v1.26.0

v1.25.10

v1.25.9

v1.25.8

v1.25.7

actions/go-versions (go)

v1.26.3: 1.26.3

Compare Source

Go 1.26.3

v1.26.2: 1.26.2

Compare Source

Go 1.26.2

v1.26.1: 1.26.1

Compare Source

Go 1.26.1

v1.26.0: 1.26.0

Compare Source

Go 1.26.0

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