[Automation] Bump Golang version to 1.26.4

[github-actions]

Bump golang-version to latest version

Update .go-version with 1.26.4

1 file(s) updated with "1.26.4": * .go-version

Update go.mod

1 file(s) updated with "go 1.26.4": * go.mod

Update Dockerfile golang image

1 file(s) updated with "FROM golang:1.26.4": * Dockerfile

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