build(deps): Bump golang from 1.25.5-bookworm to 1.26rc2-bookworm

Bumps golang from 1.25.5-bookworm to 1.26rc2-bookworm.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.26rc2-bookworm
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM golang:1.25.5-bookworm AS golang
+FROM golang:1.26rc2-bookworm AS golang
 
 FROM python:3.13.11-bookworm