[PMK-6907][CVE-2025-68121] Upgrade go from 1.23 to 1.26

[snslk]

Fix Security Vulnerability

https://github.com/platform9/luigi/security/code-scanning/106

Fix

The crypto/tls fix is part of the Go stdlib, so upgrading the Go toolchain itself (not a dependency) is the correct remediation.
Go version upgrade from 1.23 to 1.26 .

Testing

Manual

➜  ~ git:(main) ✗ k get pods -n luigi-system                                                                            
NAME                                        READY   STATUS    RESTARTS   AGE
cert-manager-775656cd8c-dpjkx               1/1     Running   0          3h12m
cert-manager-cainjector-7b4fc5b89-5vdpf     1/1     Running   0          3h12m
cert-manager-webhook-6b4c7f6888-4gvld       1/1     Running   0          3h12m
luigi-controller-manager-79ddbdc98d-zszz5   2/2     Running   0          2m46s
➜  ~ git:(main) ✗ 
➜  ~ git:(main) ✗ k get pods -n luigi-system luigi-controller-manager-79ddbdc98d-zszz5  -oyaml | grep image | grep luigi
    image: quay.io/platform9/luigi-plugins:private-snh-fix_code_scan-pmk-4767864
    image: quay.io/platform9/luigi-plugins:private-snh-fix_code_scan-pmk-4767864
    imageID: quay.io/platform9/luigi-plugins@sha256:9f3447e7000486d6a6153ec0cb35490357f1c6990dac7f414cc9dd148dc231e6

[windsurf-bot]

Looks good to me 🤙

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