chore(deps): update golang docker tag to v1.26.0

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This PR contains the following updates:

Package	Type	Update	Change
golang	final	minor	1.24.5 → 1.26.0

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PR Summary

Low Risk
Minimal change limited to the build environment; main risk is unexpected compile/test or dependency compatibility differences under Go 1.26.

Overview
Updates the Docker build stage to use golang:1.26.0 instead of 1.24.5, bumping the Go toolchain used to compile the application image.

^{Written by Cursor Bugbot for commit 8cc0087. This will update automatically on new commits. Configure here.}