Update Go to `v1.25.9`

[digitalghost-dev]

There are several CVEs that are present in the current project's Go version (v1.25.8) in Go's standard library.
Updating to v1.25.9 fixes these:

NAME                               INSTALLED   FIXED IN        TYPE       VULNERABILITY        SEVERITY  EPSS %  RISK
stdlib                             go1.25.8    1.25.9, 1.26.2  go-module  CVE-2026-27143       Critical  4.62    < 0.1
stdlib                             go1.25.8    1.25.9, 1.26.2  go-module  CVE-2026-32281       High      4.66    < 0.1
stdlib                             go1.25.8    1.25.9, 1.26.2  go-module  CVE-2026-32280       High      4.42    < 0.1
stdlib                             go1.25.8    1.25.9, 1.26.2  go-module  CVE-2026-32283       High      4.27    < 0.1
stdlib                             go1.25.8    1.25.9, 1.26.2  go-module  CVE-2026-27140       High      2.74    < 0.1
stdlib                             go1.25.8    1.25.9, 1.26.2  go-module  CVE-2026-32289       Medium    1.21    < 0.1
stdlib                             go1.25.8    1.25.9, 1.26.2  go-module  CVE-2026-32282       Medium    0.81    < 0.1
stdlib                             go1.25.8    1.25.9, 1.26.2  go-module  CVE-2026-27144       High      0.31    < 0.1
stdlib                             go1.25.8    1.25.9, 1.26.2  go-module  CVE-2026-32288       Medium    0.18    < 0.1