chore(deps): bump golang from 1.25-alpine to 1.26-alpine

Bumps golang from 1.25-alpine to 1.26-alpine.

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

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

Dockerfile

@@ -20,7 +20,7 @@ RUN npm run build
 ######
 # Build backend
 ######
-FROM --platform=${BUILDPLATFORM} golang:1.25-alpine AS builder
+FROM --platform=${BUILDPLATFORM} golang:1.26-alpine AS builder
 # Set the working directory
 WORKDIR /build
 # Download dependencies